// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) STMicroelectronics SA 2017
*
* Authors: Philippe Cornu <philippe.cornu@st.com>
* Yannick Fertre <yannick.fertre@st.com>
* Fabien Dessenne <fabien.dessenne@st.com>
* Mickael Reulier <mickael.reulier@st.com>
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_device.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include <video/videomode.h>
#include "ltdc.h"
#define NB_CRTC 1
#define CRTC_MASK GENMASK(NB_CRTC - 1, 0)
#define MAX_IRQ 4
#define MAX_ENDPOINTS 2
#define HWVER_10200 0x010200
#define HWVER_10300 0x010300
#define HWVER_20101 0x020101
/*
* The address of some registers depends on the HW version: such registers have
* an extra offset specified with reg_ofs.
*/
#define REG_OFS_NONE 0
#define REG_OFS_4 4 /* Insertion of "Layer Conf. 2" reg */
#define REG_OFS (ldev->caps.reg_ofs)
#define LAY_OFS 0x80 /* Register Offset between 2 layers */
/* Global register offsets */
#define LTDC_IDR 0x0000 /* IDentification */
#define LTDC_LCR 0x0004 /* Layer Count */
#define LTDC_SSCR 0x0008 /* Synchronization Size Configuration */
#define LTDC_BPCR 0x000C /* Back Porch Configuration */
#define LTDC_AWCR 0x0010 /* Active Width Configuration */
#define LTDC_TWCR 0x0014 /* Total Width Configuration */
#define LTDC_GCR 0x0018 /* Global Control */
#define LTDC_GC1R 0x001C /* Global Configuration 1 */
#define LTDC_GC2R 0x0020 /* Global Configuration 2 */
#define LTDC_SRCR 0x0024 /* Shadow Reload Configuration */
#define LTDC_GACR 0x0028 /* GAmma Correction */
#define LTDC_BCCR 0x002C /* Background Color Configuration */
#define LTDC_IER 0x0034 /* Interrupt Enable */
#define LTDC_ISR 0x0038 /* Interrupt Status */
#define LTDC_ICR 0x003C /* Interrupt Clear */
#define LTDC_LIPCR 0x0040 /* Line Interrupt Position Conf. */
#define LTDC_CPSR 0x0044 /* Current Position Status */
#define LTDC_CDSR 0x0048 /* Current Display Status */
/* Layer register offsets */
#define LTDC_L1LC1R (0x80) /* L1 Layer Configuration 1 */
#define LTDC_L1LC2R (0x84) /* L1 Layer Configuration 2 */
#define LTDC_L1CR (0x84 + REG_OFS)/* L1 Control */
#define LTDC_L1WHPCR (0x88 + REG_OFS)/* L1 Window Hor Position Config */
#define LTDC_L1WVPCR (0x8C + REG_OFS)/* L1 Window Vert Position Config */
#define LTDC_L1CKCR (0x90 + REG_OFS)/* L1 Color Keying Configuration */
#define LTDC_L1PFCR (0x94 + REG_OFS)/* L1 Pixel Format Configuration */
#define LTDC_L1CACR (0x98 + REG_OFS)/* L1 Constant Alpha Config */
#define LTDC_L1DCCR (0x9C + REG_OFS)/* L1 Default Color Configuration */
#define LTDC_L1BFCR (0xA0 + REG_OFS)/* L1 Blend Factors Configuration */
#define LTDC_L1FBBCR (0xA4 + REG_OFS)/* L1 FrameBuffer Bus Control */
#define LTDC_L1AFBCR (0xA8 + REG_OFS)/* L1 AuxFB Control */
#define LTDC_L1CFBAR (0xAC + REG_OFS)/* L1 Color FrameBuffer Address */
#define LTDC_L1CFBLR (0xB0 + REG_OFS)/* L1 Color FrameBuffer Length */
#define LTDC_L1CFBLNR (0xB4 + REG_OFS)/* L1 Color FrameBuffer Line Nb */
#define LTDC_L1AFBAR (0xB8 + REG_OFS)/* L1 AuxFB Address */
#define LTDC_L1AFBLR (0xBC + REG_OFS)/* L1 AuxFB Length */
#define LTDC_L1AFBLNR (0xC0 + REG_OFS)/* L1 AuxFB Line Number */
#define LTDC_L1CLUTWR (0xC4 + REG_OFS)/* L1 CLUT Write */
#define LTDC_L1YS1R (0xE0 + REG_OFS)/* L1 YCbCr Scale 1 */
#define LTDC_L1YS2R (0xE4 + REG_OFS)/* L1 YCbCr Scale 2 */
/* Bit definitions */
#define SSCR_VSH GENMASK(10, 0) /* Vertical Synchronization Height */
#define SSCR_HSW GENMASK(27, 16) /* Horizontal Synchronization Width */
#define BPCR_AVBP GENMASK(10, 0) /* Accumulated Vertical Back Porch */
#define BPCR_AHBP GENMASK(27, 16) /* Accumulated Horizontal Back Porch */
#define AWCR_AAH GENMASK(10, 0) /* Accumulated Active Height */
#define AWCR_AAW GENMASK(27, 16) /* Accumulated Active Width */
#define TWCR_TOTALH GENMASK(10, 0) /* TOTAL Height */
#define TWCR_TOTALW GENMASK(27, 16) /* TOTAL Width */
#define GCR_LTDCEN BIT(0) /* LTDC ENable */
#define GCR_DEN BIT(16) /* Dither ENable */
#define GCR_PCPOL BIT(28) /* Pixel Clock POLarity-Inverted */
#define GCR_DEPOL BIT(29) /* Data Enable POLarity-High */
#define GCR_VSPOL BIT(30) /* Vertical Synchro POLarity-High */
#define GCR_HSPOL BIT(31) /* Horizontal Synchro POLarity-High */
#define GC1R_WBCH GENMASK(3, 0) /* Width of Blue CHannel output */
#define GC1R_WGCH GENMASK(7, 4) /* Width of Green Channel output */
#define GC1R_WRCH GENMASK(11, 8) /* Width of Red Channel output */
#define GC1R_PBEN BIT(12) /* Precise Blending ENable */
#define GC1R_DT GENMASK(15, 14) /* Dithering Technique */
#define GC1R_GCT GENMASK(19, 17) /* Gamma Correction Technique */
#define GC1R_SHREN BIT(21) /* SHadow Registers ENabled */
#define GC1R_BCP BIT(22) /* Background Colour Programmable */
#define GC1R_BBEN BIT(23) /* Background Blending ENabled */
#define GC1R_LNIP BIT(24) /* Line Number IRQ Position */
#define GC1R_TP BIT(25) /* Timing Programmable */
#define GC1R_IPP BIT(26) /* IRQ Polarity Programmable */
#define GC1R_SPP BIT(27) /* Sync Polarity Programmable */
#define GC1R_DWP BIT(28) /* Dither Width Programmable */
#define GC1R_STREN BIT(29) /* STatus Registers ENabled */
#define GC1R_BMEN BIT(31) /* Blind Mode ENabled */
#define GC2R_EDCA BIT(0) /* External Display Control Ability */
#define GC2R_STSAEN BIT(1) /* Slave Timing Sync Ability ENabled */
#define GC2R_DVAEN BIT(2) /* Dual-View Ability ENabled */
#define GC2R_DPAEN BIT(3) /* Dual-Port Ability ENabled */
#define GC2R_BW GENMASK(6, 4) /* Bus Width (log2 of nb of bytes) */
#define GC2R_EDCEN BIT(7) /* External Display Control ENabled */
#define SRCR_IMR BIT(0) /* IMmediate Reload */
#define SRCR_VBR BIT(1) /* Vertical Blanking Reload */
#define BCCR_BCBLACK 0x00 /* Background Color BLACK */
#define BCCR_BCBLUE GENMASK(7, 0) /* Background Color BLUE */
#define BCCR_BCGREEN GENMASK(15, 8) /* Background Color GREEN */
#define BCCR_BCRED GENMASK(23, 16) /* Background Color RED */
#define BCCR_BCWHITE GENMASK(23, 0) /* Background Color WHITE */
#define IER_LIE BIT(0) /* Line Interrupt Enable */
#define IER_FUIE BIT(1) /* Fifo Underrun Interrupt Enable */
#define IER_TERRIE BIT(2) /* Transfer ERRor Interrupt Enable */
#define IER_RRIE BIT(3) /* Register Reload Interrupt enable */
#define CPSR_CYPOS GENMASK(15, 0) /* Current Y position */
#define ISR_LIF BIT(0) /* Line Interrupt Flag */
#define ISR_FUIF BIT(1) /* Fifo Underrun Interrupt Flag */
#define ISR_TERRIF BIT(2) /* Transfer ERRor Interrupt Flag */
#define ISR_RRIF BIT(3) /* Register Reload Interrupt Flag */
#define LXCR_LEN BIT(0) /* Layer ENable */
#define LXCR_COLKEN BIT(1) /* Color Keying Enable */
#define LXCR_CLUTEN BIT(4) /* Color Look-Up Table ENable */
#define LXWHPCR_WHSTPOS GENMASK(11, 0) /* Window Horizontal StarT POSition */
#define LXWHPCR_WHSPPOS GENMASK(27, 16) /* Window Horizontal StoP POSition */
#define LXWVPCR_WVSTPOS GENMASK(10, 0) /* Window Vertical StarT POSition */
#define LXWVPCR_WVSPPOS GENMASK(26, 16) /* Window Vertical StoP POSition */
#define LXPFCR_PF GENMASK(2, 0) /* Pixel Format */
#define LXCACR_CONSTA GENMASK(7, 0) /* CONSTant Alpha */
#define LXBFCR_BF2 GENMASK(2, 0) /* Blending Factor 2 */
#define LXBFCR_BF1 GENMASK(10, 8) /* Blending Factor 1 */
#define LXCFBLR_CFBLL GENMASK(12, 0) /* Color Frame Buffer Line Length */
#define LXCFBLR_CFBP GENMASK(28, 16) /* Color Frame Buffer Pitch in bytes */
#define LXCFBLNR_CFBLN GENMASK(10, 0) /* Color Frame Buffer Line Number */
#define CLUT_SIZE 256
#define CONSTA_MAX 0xFF /* CONSTant Alpha MAX= 1.0 */
#define BF1_PAXCA 0x600 /* Pixel Alpha x Constant Alpha */
#define BF1_CA 0x400 /* Constant Alpha */
#define BF2_1PAXCA 0x007 /* 1 - (Pixel Alpha x Constant Alpha) */
#define BF2_1CA 0x005 /* 1 - Constant Alpha */
#define NB_PF 8 /* Max nb of HW pixel format */
enum ltdc_pix_fmt {
PF_NONE,
/* RGB formats */
PF_ARGB8888, /* ARGB [32 bits] */
PF_RGBA8888, /* RGBA [32 bits] */
PF_RGB888, /* RGB [24 bits] */
PF_RGB565, /* RGB [16 bits] */
PF_ARGB1555, /* ARGB A:1 bit RGB:15 bits [16 bits] */
PF_ARGB4444, /* ARGB A:4 bits R/G/B: 4 bits each [16 bits] */
/* Indexed formats */
PF_L8, /* Indexed 8 bits [8 bits] */
PF_AL44, /* Alpha:4 bits + indexed 4 bits [8 bits] */
PF_AL88 /* Alpha:8 bits + indexed 8 bits [16 bits] */
};
/* The index gives the encoding of the pixel format for an HW version */
static const enum ltdc_pix_fmt ltdc_pix_fmt_a0[NB_PF] = {
PF_ARGB8888, /* 0x00 */
PF_RGB888, /* 0x01 */
PF_RGB565, /* 0x02 */
PF_ARGB1555, /* 0x03 */
PF_ARGB4444, /* 0x04 */
PF_L8, /* 0x05 */
PF_AL44, /* 0x06 */
PF_AL88 /* 0x07 */
};
static const enum ltdc_pix_fmt ltdc_pix_fmt_a1[NB_PF] = {
PF_ARGB8888, /* 0x00 */
PF_RGB888, /* 0x01 */
PF_RGB565, /* 0x02 */
PF_RGBA8888, /* 0x03 */
PF_AL44, /* 0x04 */
PF_L8, /* 0x05 */
PF_ARGB1555, /* 0x06 */
PF_ARGB4444 /* 0x07 */
};
static inline u32 reg_read(void __iomem *base, u32 reg)
{
return readl_relaxed(base + reg);
}
static inline void reg_write(void __iomem *base, u32 reg, u32 val)
{
writel_relaxed(val, base + reg);
}
static inline void reg_set(void __iomem *base, u32 reg, u32 mask)
{
reg_write(base, reg, reg_read(base, reg) | mask);
}
static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
{
reg_write(base, reg, reg_read(base, reg) & ~mask);
}
static inline void reg_update_bits(void __iomem *base, u32 reg, u32 mask,
u32 val)
{
reg_write(base, reg, (reg_read(base, reg) & ~mask) | val);
}
static inline struct ltdc_device *crtc_to_ltdc(struct drm_crtc *crtc)
{
return (struct ltdc_device *)crtc->dev->dev_private;
}
static inline struct ltdc_device *plane_to_ltdc(struct drm_plane *plane)
{
return (struct ltdc_device *)plane->dev->dev_private;
}
static inline struct ltdc_device *encoder_to_ltdc(struct drm_encoder *enc)
{
return (struct ltdc_device *)enc->dev->dev_private;
}
static inline enum ltdc_pix_fmt to_ltdc_pixelformat(u32 drm_fmt)
{
enum ltdc_pix_fmt pf;
switch (drm_fmt) {
case DRM_FORMAT_ARGB8888:
case DRM_FORMAT_XRGB8888:
pf = PF_ARGB8888;
break;
case DRM_FORMAT_RGBA8888:
case DRM_FORMAT_RGBX8888:
pf = PF_RGBA8888;
break;
case DRM_FORMAT_RGB888:
pf = PF_RGB888;
break;
case DRM_FORMAT_RGB565:
pf = PF_RGB565;
break;
case DRM_FORMAT_ARGB1555:
case DRM_FORMAT_XRGB1555:
pf = PF_ARGB1555;
break;
case DRM_FORMAT_ARGB4444:
case DRM_FORMAT_XRGB4444:
pf = PF_ARGB4444;
break;
case DRM_FORMAT_C8:
pf = PF_L8;
break;
default:
pf = PF_NONE;
break;
/* Note: There are no DRM_FORMAT for AL44 and AL88 */
}
return pf;
}
static inline u32 to_drm_pixelformat(enum ltdc_pix_fmt pf)
{
switch (pf) {
case PF_ARGB8888:
return DRM_FORMAT_ARGB8888;
case PF_RGBA8888:
return DRM_FORMAT_RGBA8888;
case PF_RGB888:
return DRM_FORMAT_RGB888;
case PF_RGB565:
return DRM_FORMAT_RGB565;
case PF_ARGB1555:
return DRM_FORMAT_ARGB1555;
case PF_ARGB4444:
return DRM_FORMAT_ARGB4444;
case PF_L8:
return DRM_FORMAT_C8;
case PF_AL44: /* No DRM support */
case PF_AL88: /* No DRM support */
case PF_NONE:
default:
return 0;
}
}
static inline u32 get_pixelformat_without_alpha(u32 drm)
{
switch (drm) {
case DRM_FORMAT_ARGB4444:
return DRM_FORMAT_XRGB4444;
case DRM_FORMAT_RGBA4444:
return DRM_FORMAT_RGBX4444;
case DRM_FORMAT_ARGB1555:
return DRM_FORMAT_XRGB1555;
case DRM_FORMAT_RGBA5551:
return DRM_FORMAT_RGBX5551;
case DRM_FORMAT_ARGB8888:
return DRM_FORMAT_XRGB8888;
case DRM_FORMAT_RGBA8888:
return DRM_FORMAT_RGBX8888;
default:
return 0;
}
}
static irqreturn_t ltdc_irq_thread(int irq, void *arg)
{
struct drm_device *ddev = arg;
struct ltdc_device *ldev = ddev->dev_private;
struct drm_crtc *crtc = drm_crtc_from_index(ddev, 0);
/* Line IRQ : trigger the vblank event */
if (ldev->irq_status & ISR_LIF)
drm_crtc_handle_vblank(crtc);
/* Save FIFO Underrun & Transfer Error status */
mutex_lock(&ldev->err_lock);
if (ldev->irq_status & ISR_FUIF)
ldev->error_status |= ISR_FUIF;
if (ldev->irq_status & ISR_TERRIF)
ldev->error_status |= ISR_TERRIF;
mutex_unlock(&ldev->err_lock);
return IRQ_HANDLED;
}
static irqreturn_t ltdc_irq(int irq, void *arg)
{
struct drm_device *ddev = arg;
struct ltdc_device *ldev = ddev->dev_private;
/* Read & Clear the interrupt status */
ldev->irq_status = reg_read(ldev->regs, LTDC_ISR);
reg_write(ldev->regs, LTDC_ICR, ldev->irq_status);
return IRQ_WAKE_THREAD;
}
/*
* DRM_CRTC
*/
static void ltdc_crtc_update_clut(struct drm_crtc *crtc)
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
struct drm_color_lut *lut;
u32 val;
int i;
if (!crtc->state->color_mgmt_changed || !crtc->state->gamma_lut)
return;
lut = (struct drm_color_lut *)crtc->state->gamma_lut->data;
for (i = 0; i < CLUT_SIZE; i++, lut++) {
val = ((lut->red << 8) & 0xff0000) | (lut->green & 0xff00) |
(lut->blue >> 8) | (i << 24);
reg_write(ldev->regs, LTDC_L1CLUTWR, val);
}
}
static void ltdc_crtc_atomic_enable(struct drm_crtc *crtc,
struct drm_crtc_state *old_state)
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
DRM_DEBUG_DRIVER("\n");
/* Sets the background color value */
reg_write(ldev->regs, LTDC_BCCR, BCCR_BCBLACK);
/* Enable IRQ */
reg_set(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);
/* Immediately commit the planes */
reg_set(ldev->regs, LTDC_SRCR, SRCR_IMR);
/* Enable LTDC */
reg_set(ldev->regs, LTDC_GCR, GCR_LTDCEN);
drm_crtc_vblank_on(crtc);
}
static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc,
struct drm_crtc_state *old_state)
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
DRM_DEBUG_DRIVER("\n");
drm_crtc_vblank_off(crtc);
/* disable LTDC */
reg_clear(ldev->regs, LTDC_GCR, GCR_LTDCEN);
/* disable IRQ */
reg_clear(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);
/* immediately commit disable of layers before switching off LTDC */
reg_set(ldev->regs, LTDC_SRCR, SRCR_IMR);
}
#define CLK_TOLERANCE_HZ 50
static enum drm_mode_status
ltdc_crtc_mode_valid(struct drm_crtc *crtc,
const struct drm_display_mode *mode)
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
int target = mode->clock * 1000;
int target_min = target - CLK_TOLERANCE_HZ;
int target_max = target + CLK_TOLERANCE_HZ;
int result;
result = clk_round_rate(ldev->pixel_clk, target);
DRM_DEBUG_DRIVER("clk rate target %d, available %d\n", target, result);
/* Filter modes according to the max frequency supported by the pads */
if (result > ldev->caps.pad_max_freq_hz)
return MODE_CLOCK_HIGH;
/*
* Accept all "preferred" modes:
* - this is important for panels because panel clock tolerances are
* bigger than hdmi ones and there is no reason to not accept them
* (the fps may vary a little but it is not a problem).
* - the hdmi preferred mode will be accepted too, but userland will
* be able to use others hdmi "valid" modes if necessary.
*/
if (mode->type & DRM_MODE_TYPE_PREFERRED)
return MODE_OK;
/*
* Filter modes according to the clock value, particularly useful for
* hdmi modes that require precise pixel clocks.
*/
if (result < target_min || result > target_max)
return MODE_CLOCK_RANGE;
return MODE_OK;
}
static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
int rate = mode->clock * 1000;
/*
* TODO clk_round_rate() does not work yet. When ready, it can
* be used instead of clk_set_rate() then clk_get_rate().
*/
clk_disable(ldev->pixel_clk);
if (clk_set_rate(ldev->pixel_clk, rate) < 0) {
DRM_ERROR("Cannot set rate (%dHz) for pixel clk\n", rate);
return false;
}
clk_enable(ldev->pixel_clk);
adjusted_mode->clock = clk_get_rate(ldev->pixel_clk) / 1000;
return true;
}
static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
struct drm_display_mode *mode = &crtc->state->adjusted_mode;
struct videomode vm;
u32 hsync, vsync, accum_hbp, accum_vbp, accum_act_w, accum_act_h;
u32 total_width, total_height;
u32 val;
drm_display_mode_to_videomode(mode, &vm);
DRM_DEBUG_DRIVER("CRTC:%d mode:%s\n", crtc->base.id, mode->name);
DRM_DEBUG_DRIVER("Video mode: %dx%d", vm.hactive, vm.vactive);
DRM_DEBUG_DRIVER(" hfp %d hbp %d hsl %d vfp %d vbp %d vsl %d\n",
vm.hfront_porch, vm.hback_porch, vm.hsync_len,
vm.vfront_porch, vm.vback_porch, vm.vsync_len);
/* Convert video timings to ltdc timings */
hsync = vm.hsync_len - 1;
vsync = vm.vsync_len - 1;
accum_hbp = hsync + vm.hback_porch;
accum_vbp = vsync + vm.vback_porch;
accum_act_w = accum_hbp + vm.hactive;
accum_act_h = accum_vbp + vm.vactive;
total_width = accum_act_w + vm.hfront_porch;
total_height = accum_act_h + vm.vfront_porch;
/* Configures the HS, VS, DE and PC polarities. Default Active Low */
val = 0;
if (vm.flags & DISPLAY_FLAGS_HSYNC_HIGH)
val |= GCR_HSPOL;
if (vm.flags & DISPLAY_FLAGS_VSYNC_HIGH)
val |= GCR_VSPOL;
if (vm.flags & DISPLAY_FLAGS_DE_HIGH)
val |= GCR_DEPOL;
if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
val |= GCR_PCPOL;
reg_update_bits(ldev->regs, LTDC_GCR,
GCR_HSPOL | GCR_VSPOL | GCR_DEPOL | GCR_PCPOL, val);
/* Set Synchronization size */
val = (hsync << 16) | vsync;
reg_update_bits(ldev->regs, LTDC_SSCR, SSCR_VSH | SSCR_HSW, val);
/* Set Accumulated Back porch */
val = (accum_hbp << 16) | accum_vbp;
reg_update_bits(ldev->regs, LTDC_BPCR, BPCR_AVBP | BPCR_AHBP, val);
/* Set Accumulated Active Width */
val = (accum_act_w << 16) | accum_act_h;
reg_update_bits(ldev->regs, LTDC_AWCR, AWCR_AAW | AWCR_AAH, val);
/* Set total width & height */
val = (total_width << 16) | total_height;
reg_update_bits(ldev->regs, LTDC_TWCR, TWCR_TOTALH | TWCR_TOTALW, val);
reg_write(ldev->regs, LTDC_LIPCR, (accum_act_h + 1));
}
static void ltdc_crtc_atomic_flush(struct drm_crtc *crtc,
struct drm_crtc_state *old_crtc_state)
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
struct drm_pending_vblank_event *event = crtc->state->event;
DRM_DEBUG_ATOMIC("\n");
ltdc_crtc_update_clut(crtc);
/* Commit shadow registers = update planes at next vblank */
reg_set(ldev->regs, LTDC_SRCR, SRCR_VBR);
if (event) {
crtc->state->event = NULL;
spin_lock_irq(&crtc->dev->event_lock);
if (drm_crtc_vblank_get(crtc) == 0)
drm_crtc_arm_vblank_event(crtc, event);
else
drm_crtc_send_vblank_event(crtc, event);
spin_unlock_irq(&crtc->dev->event_lock);
}
}
static const struct drm_crtc_helper_funcs ltdc_crtc_helper_funcs = {
.mode_valid = ltdc_crtc_mode_valid,
.mode_fixup = ltdc_crtc_mode_fixup,
.mode_set_nofb = ltdc_crtc_mode_set_nofb,
.atomic_flush = ltdc_crtc_atomic_flush,
.atomic_enable = ltdc_crtc_atomic_enable,
.atomic_disable = ltdc_crtc_atomic_disable,
};
static int ltdc_crtc_enable_vblank(struct drm_crtc *crtc)
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
DRM_DEBUG_DRIVER("\n");
reg_set(ldev->regs, LTDC_IER, IER_LIE);
return 0;
}
static void ltdc_crtc_disable_vblank(struct drm_crtc *crtc)
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
DRM_DEBUG_DRIVER("\n");
reg_clear(ldev->regs, LTDC_IER, IER_LIE);
}
bool ltdc_crtc_scanoutpos(struct drm_device *ddev, unsigned int pipe,
bool in_vblank_irq, int *vpos, int *hpos,
ktime_t *stime, ktime_t *etime,
const struct drm_display_mode *mode)
{
struct ltdc_device *ldev = ddev->dev_private;
int line, vactive_start, vactive_end, vtotal;
if (stime)
*stime = ktime_get();
/* The active area starts after vsync + front porch and ends
* at vsync + front porc + display size.
* The total height also include back porch.
* We have 3 possible cases to handle:
* - line < vactive_start: vpos = line - vactive_start and will be
* negative
* - vactive_start < line < vactive_end: vpos = line - vactive_start
* and will be positive
* - line > vactive_end: vpos = line - vtotal - vactive_start
* and will negative
*
* Computation for the two first cases are identical so we can
* simplify the code and only test if line > vactive_end
*/
line = reg_read(ldev->regs, LTDC_CPSR) & CPSR_CYPOS;
vactive_start = reg_read(ldev->regs, LTDC_BPCR) & BPCR_AVBP;
vactive_end = reg_read(ldev->regs, LTDC_AWCR) & AWCR_AAH;
vtotal = reg_read(ldev->regs, LTDC_TWCR) & TWCR_TOTALH;
if (line > vactive_end)
*vpos = line - vtotal - vactive_start;
else
*vpos = line - vactive_start;
*hpos = 0;
if (etime)
*etime = ktime_get();
return true;
}
static const struct drm_crtc_funcs ltdc_crtc_funcs = {
.destroy = drm_crtc_cleanup,
.set_config = drm_atomic_helper_set_config,
.page_flip = drm_atomic_helper_page_flip,
.reset = drm_atomic_helper_crtc_reset,
.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
.enable_vblank = ltdc_crtc_enable_vblank,
.disable_vblank = ltdc_crtc_disable_vblank,
.gamma_set = drm_atomic_helper_legacy_gamma_set,
};
/*
* DRM_PLANE
*/
static int ltdc_plane_atomic_check(struct drm_plane *plane,
struct drm_plane_state *state)
{
struct drm_framebuffer *fb = state->fb;
u32 src_w, src_h;
DRM_DEBUG_DRIVER("\n");
if (!fb)
return 0;
/* convert src_ from 16:16 format */
src_w = state->src_w >> 16;
src_h = state->src_h >> 16;
/* Reject scaling */
if (src_w != state->crtc_w || src_h != state->crtc_h) {
DRM_ERROR("Scaling is not supported");
return -EINVAL;
}
return 0;
}
static void ltdc_plane_atomic_update(struct drm_plane *plane,
struct drm_plane_state *oldstate)
{
struct ltdc_device *ldev = plane_to_ltdc(plane);
struct drm_plane_state *state = plane->state;
struct drm_framebuffer *fb = state->fb;
u32 lofs = plane->index * LAY_OFS;
u32 x0 = state->crtc_x;
u32 x1 = state->crtc_x + state->crtc_w - 1;
u32 y0 = state->crtc_y;
u32 y1 = state->crtc_y + state->crtc_h - 1;
u32 src_x, src_y, src_w, src_h;
u32 val, pitch_in_bytes, line_length, paddr, ahbp, avbp, bpcr;
enum ltdc_pix_fmt pf;
if (!state->crtc || !fb) {
DRM_DEBUG_DRIVER("fb or crtc NULL");
return;
}
/* convert src_ from 16:16 format */
src_x = state->src_x >> 16;
src_y = state->src_y >> 16;
src_w = state->src_w >> 16;
src_h = state->src_h >> 16;
DRM_DEBUG_DRIVER("plane:%d fb:%d (%dx%d)@(%d,%d) -> (%dx%d)@(%d,%d)\n",
plane->base.id, fb->base.id,
src_w, src_h, src_x, src_y,
state->crtc_w, state->crtc_h,
state->crtc_x, state->crtc_y);
bpcr = reg_read(ldev->regs, LTDC_BPCR);
ahbp = (bpcr & BPCR_AHBP) >> 16;
avbp = bpcr & BPCR_AVBP;
/* Configures the horizontal start and stop position */
val = ((x1 + 1 + ahbp) << 16) + (x0 + 1 + ahbp);
reg_update_bits(ldev->regs, LTDC_L1WHPCR + lofs,
LXWHPCR_WHSTPOS | LXWHPCR_WHSPPOS, val);
/* Configures the vertical start and stop position */
val = ((y1 + 1 + avbp) << 16) + (y0 + 1 + avbp);
reg_update_bits(ldev->regs, LTDC_L1WVPCR + lofs,
LXWVPCR_WVSTPOS | LXWVPCR_WVSPPOS, val);
/* Specifies the pixel format */
pf = to_ltdc_pixelformat(fb->format->format);
for (val = 0; val < NB_PF; val++)
if (ldev->caps.pix_fmt_hw[val] == pf)
break;
if (val == NB_PF) {
DRM_ERROR("Pixel format %.4s not supported\n",
(char *)&fb->format->format);
val = 0; /* set by default ARGB 32 bits */
}
reg_update_bits(ldev->regs, LTDC_L1PFCR + lofs, LXPFCR_PF, val);
/* Configures the color frame buffer pitch in bytes & line length */
pitch_in_bytes = fb->pitches[0];
line_length = drm_format_plane_cpp(fb->format->format, 0) *
(x1 - x0 + 1) + (ldev->caps.bus_width >> 3) - 1;
val = ((pitch_in_bytes << 16) | line_length);
reg_update_bits(ldev->regs, LTDC_L1CFBLR + lofs,
LXCFBLR_CFBLL | LXCFBLR_CFBP, val);
/* Specifies the constant alpha value */
val = CONSTA_MAX;
reg_update_bits(ldev->regs, LTDC_L1CACR + lofs, LXCACR_CONSTA, val);
/* Specifies the blending factors */
val = BF1_PAXCA | BF2_1PAXCA;
if (!fb->format->has_alpha)
val = BF1_CA | BF2_1CA;
/* Manage hw-specific capabilities */
if (ldev->caps.non_alpha_only_l1 &&
plane->type != DRM_PLANE_TYPE_PRIMARY)
val = BF1_PAXCA | BF2_1PAXCA;
reg_update_bits(ldev->regs, LTDC_L1BFCR + lofs,
LXBFCR_BF2 | LXBFCR_BF1, val);
/* Configures the frame buffer line number */
val = y1 - y0 + 1;
reg_update_bits(ldev->regs, LTDC_L1CFBLNR + lofs, LXCFBLNR_CFBLN, val);
/* Sets the FB address */
paddr = (u32)drm_fb_cma_get_gem_addr(fb, state, 0);
DRM_DEBUG_DRIVER("fb: phys 0x%08x", paddr);
reg_write(ldev->regs, LTDC_L1CFBAR + lofs, paddr);
/* Enable layer and CLUT if needed */
val = fb->format->format == DRM_FORMAT_C8 ? LXCR_CLUTEN : 0;
val |= LXCR_LEN;
reg_update_bits(ldev->regs, LTDC_L1CR + lofs,
LXCR_LEN | LXCR_CLUTEN, val);
ldev->plane_fpsi[plane->index].counter++;
mutex_lock(&ldev->err_lock);
if (ldev->error_status & ISR_FUIF) {
DRM_DEBUG_DRIVER("Fifo underrun\n");
ldev->error_status &= ~ISR_FUIF;
}
if (ldev->error_status & ISR_TERRIF) {
DRM_DEBUG_DRIVER("Transfer error\n");
ldev->error_status &= ~ISR_TERRIF;
}
mutex_unlock(&ldev->err_lock);
}
static void ltdc_plane_atomic_disable(struct drm_plane *plane,
struct drm_plane_state *oldstate)
{
struct ltdc_device *ldev = plane_to_ltdc(plane);
u32 lofs = plane->index * LAY_OFS;
/* disable layer */
reg_clear(ldev->regs, LTDC_L1CR + lofs, LXCR_LEN);
DRM_DEBUG_DRIVER("CRTC:%d plane:%d\n",
oldstate->crtc->base.id, plane->base.id);
}
static void ltdc_plane_atomic_print_state(struct drm_printer *p,
const struct drm_plane_state *state)
{
struct drm_plane *plane = state->plane;
struct ltdc_device *ldev = plane_to_ltdc(plane);
struct fps_info *fpsi = &ldev->plane_fpsi[plane->index];
int ms_since_last;
ktime_t now;
now = ktime_get();
ms_since_last = ktime_to_ms(ktime_sub(now, fpsi->last_timestamp));
drm_printf(p, "\tuser_updates=%dfps\n",
DIV_ROUND_CLOSEST(fpsi->counter * 1000, ms_since_last));
fpsi->last_timestamp = now;
fpsi->counter = 0;
}
static const struct drm_plane_funcs ltdc_plane_funcs = {
.update_plane = drm_atomic_helper_update_plane,
.disable_plane = drm_atomic_helper_disable_plane,
.destroy = drm_plane_cleanup,
.reset = drm_atomic_helper_plane_reset,
.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
.atomic_print_state = ltdc_plane_atomic_print_state,
};
static const struct drm_plane_helper_funcs ltdc_plane_helper_funcs = {
.atomic_check = ltdc_plane_atomic_check,
.atomic_update = ltdc_plane_atomic_update,
.atomic_disable = ltdc_plane_atomic_disable,
};
static struct drm_plane *ltdc_plane_create(struct drm_device *ddev,
enum drm_plane_type type)
{
unsigned long possible_crtcs = CRTC_MASK;
struct ltdc_device *ldev = ddev->dev_private;
struct device *dev = ddev->dev;
struct drm_plane *plane;
unsigned int i, nb_fmt = 0;
u32 formats[NB_PF * 2];
u32 drm_fmt, drm_fmt_no_alpha;
int ret;
/* Get supported pixel formats */
for (i = 0; i < NB_PF; i++) {
drm_fmt = to_drm_pixelformat(ldev->caps.pix_fmt_hw[i]);
if (!drm_fmt)
continue;
formats[nb_fmt++] = drm_fmt;
/* Add the no-alpha related format if any & supported */
drm_fmt_no_alpha = get_pixelformat_without_alpha(drm_fmt);
if (!drm_fmt_no_alpha)
continue;
/* Manage hw-specific capabilities */
if (ldev->caps.non_alpha_only_l1 &&
type != DRM_PLANE_TYPE_PRIMARY)
continue;
formats[nb_fmt++] = drm_fmt_no_alpha;
}
plane = devm_kzalloc(dev, sizeof(*plane), GFP_KERNEL);
if (!plane)
return NULL;
ret = drm_universal_plane_init(ddev, plane, possible_crtcs,
<dc_plane_funcs, formats, nb_fmt,
NULL, type, NULL);
if (ret < 0)
return NULL;
drm_plane_helper_add(plane, <dc_plane_helper_funcs);
DRM_DEBUG_DRIVER("plane:%d created\n", plane->base.id);
return plane;
}
static void ltdc_plane_destroy_all(struct drm_device *ddev)
{
struct drm_plane *plane, *plane_temp;
list_for_each_entry_safe(plane, plane_temp,
&ddev->mode_config.plane_list, head)
drm_plane_cleanup(plane);
}
static int ltdc_crtc_init(struct drm_device *ddev, struct drm_crtc *crtc)
{
struct ltdc_device *ldev = ddev->dev_private;
struct drm_plane *primary, *overlay;
unsigned int i;
int ret;
primary = ltdc_plane_create(ddev, DRM_PLANE_TYPE_PRIMARY);
if (!primary) {
DRM_ERROR("Can not create primary plane\n");
return -EINVAL;
}
ret = drm_crtc_init_with_planes(ddev, crtc, primary, NULL,
<dc_crtc_funcs, NULL);
if (ret) {
DRM_ERROR("Can not initialize CRTC\n");
goto cleanup;
}
drm_crtc_helper_add(crtc, <dc_crtc_helper_funcs);
drm_mode_crtc_set_gamma_size(crtc, CLUT_SIZE);
drm_crtc_enable_color_mgmt(crtc, 0, false, CLUT_SIZE);
DRM_DEBUG_DRIVER("CRTC:%d created\n", crtc->base.id);
/* Add planes. Note : the first layer is used by primary plane */
for (i = 1; i < ldev->caps.nb_layers; i++) {
overlay = ltdc_plane_create(ddev, DRM_PLANE_TYPE_OVERLAY);
if (!overlay) {
ret = -ENOMEM;
DRM_ERROR("Can not create overlay plane %d\n", i);
goto cleanup;
}
}
return 0;
cleanup:
ltdc_plane_destroy_all(ddev);
return ret;
}
/*
* DRM_ENCODER
*/
static const struct drm_encoder_funcs ltdc_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
static int ltdc_encoder_init(struct drm_device *ddev, struct drm_bridge *bridge)
{
struct drm_encoder *encoder;
int ret;
encoder = devm_kzalloc(ddev->dev, sizeof(*encoder), GFP_KERNEL);
if (!encoder)
return -ENOMEM;
encoder->possible_crtcs = CRTC_MASK;
encoder->possible_clones = 0; /* No cloning support */
drm_encoder_init(ddev, encoder, <dc_encoder_funcs,
DRM_MODE_ENCODER_DPI, NULL);
ret = drm_bridge_attach(encoder, bridge, NULL);
if (ret) {
drm_encoder_cleanup(encoder);
return -EINVAL;
}
DRM_DEBUG_DRIVER("Bridge encoder:%d created\n", encoder->base.id);
return 0;
}
static int ltdc_get_caps(struct drm_device *ddev)
{
struct ltdc_device *ldev = ddev->dev_private;
u32 bus_width_log2, lcr, gc2r;
/* at least 1 layer must be managed */
lcr = reg_read(ldev->regs, LTDC_LCR);
ldev->caps.nb_layers = max_t(int, lcr, 1);
/* set data bus width */
gc2r = reg_read(ldev->regs, LTDC_GC2R);
bus_width_log2 = (gc2r & GC2R_BW) >> 4;
ldev->caps.bus_width = 8 << bus_width_log2;
ldev->caps.hw_version = reg_read(ldev->regs, LTDC_IDR);
switch (ldev->caps.hw_version) {
case HWVER_10200:
case HWVER_10300:
ldev->caps.reg_ofs = REG_OFS_NONE;
ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a0;
/*
* Hw older versions support non-alpha color formats derived
* from native alpha color formats only on the primary layer.
* For instance, RG16 native format without alpha works fine
* on 2nd layer but XR24 (derived color format from AR24)
* does not work on 2nd layer.
*/
ldev->caps.non_alpha_only_l1 = true;
ldev->caps.pad_max_freq_hz = 90000000;
if (ldev->caps.hw_version == HWVER_10200)
ldev->caps.pad_max_freq_hz = 65000000;
break;
case HWVER_20101:
ldev->caps.reg_ofs = REG_OFS_4;
ldev->caps.pix_fmt_hw = ltdc_pix_fmt_a1;
ldev->caps.non_alpha_only_l1 = false;
ldev->caps.pad_max_freq_hz = 150000000;
break;
default:
return -ENODEV;
}
return 0;
}
int ltdc_load(struct drm_device *ddev)
{
struct platform_device *pdev = to_platform_device(ddev->dev);
struct ltdc_device *ldev = ddev->dev_private;
struct device *dev = ddev->dev;
struct device_node *np = dev->of_node;
struct drm_bridge *bridge[MAX_ENDPOINTS] = {NULL};
struct drm_panel *panel[MAX_ENDPOINTS] = {NULL};
struct drm_crtc *crtc;
struct reset_control *rstc;
struct resource *res;
int irq, ret, i, endpoint_not_ready = -ENODEV;
DRM_DEBUG_DRIVER("\n");
/* Get endpoints if any */
for (i = 0; i < MAX_ENDPOINTS; i++) {
ret = drm_of_find_panel_or_bridge(np, 0, i, &panel[i],
&bridge[i]);
/*
* If at least one endpoint is -EPROBE_DEFER, defer probing,
* else if at least one endpoint is ready, continue probing.
*/
if (ret == -EPROBE_DEFER)
return ret;
else if (!ret)
endpoint_not_ready = 0;
}
if (endpoint_not_ready)
return endpoint_not_ready;
rstc = devm_reset_control_get_exclusive(dev, NULL);
mutex_init(&ldev->err_lock);
ldev->pixel_clk = devm_clk_get(dev, "lcd");
if (IS_ERR(ldev->pixel_clk)) {
DRM_ERROR("Unable to get lcd clock\n");
return -ENODEV;
}
if (clk_prepare_enable(ldev->pixel_clk)) {
DRM_ERROR("Unable to prepare pixel clock\n");
return -ENODEV;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ldev->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(ldev->regs)) {
DRM_ERROR("Unable to get ltdc registers\n");
ret = PTR_ERR(ldev->regs);
goto err;
}
for (i = 0; i < MAX_IRQ; i++) {
irq = platform_get_irq(pdev, i);
if (irq < 0)
continue;
ret = devm_request_threaded_irq(dev, irq, ltdc_irq,
ltdc_irq_thread, IRQF_ONESHOT,
dev_name(dev), ddev);
if (ret) {
DRM_ERROR("Failed to register LTDC interrupt\n");
goto err;
}
}
if (!IS_ERR(rstc)) {
reset_control_assert(rstc);
usleep_range(10, 20);
reset_control_deassert(rstc);
}
/* Disable interrupts */
reg_clear(ldev->regs, LTDC_IER,
IER_LIE | IER_RRIE | IER_FUIE | IER_TERRIE);
ret = ltdc_get_caps(ddev);
if (ret) {
DRM_ERROR("hardware identifier (0x%08x) not supported!\n",
ldev->caps.hw_version);
goto err;
}
DRM_INFO("ltdc hw version 0x%08x - ready\n", ldev->caps.hw_version);
/* Add endpoints panels or bridges if any */
for (i = 0; i < MAX_ENDPOINTS; i++) {
if (panel[i]) {
bridge[i] = drm_panel_bridge_add(panel[i],
DRM_MODE_CONNECTOR_DPI);
if (IS_ERR(bridge[i])) {
DRM_ERROR("panel-bridge endpoint %d\n", i);
ret = PTR_ERR(bridge[i]);
goto err;
}
}
if (bridge[i]) {
ret = ltdc_encoder_init(ddev, bridge[i]);
if (ret) {
DRM_ERROR("init encoder endpoint %d\n", i);
goto err;
}
}
}
crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
if (!crtc) {
DRM_ERROR("Failed to allocate crtc\n");
ret = -ENOMEM;
goto err;
}
ret = ltdc_crtc_init(ddev, crtc);
if (ret) {
DRM_ERROR("Failed to init crtc\n");
goto err;
}
ret = drm_vblank_init(ddev, NB_CRTC);
if (ret) {
DRM_ERROR("Failed calling drm_vblank_init()\n");
goto err;
}
/* Allow usage of vblank without having to call drm_irq_install */
ddev->irq_enabled = 1;
return 0;
err:
for (i = 0; i < MAX_ENDPOINTS; i++)
drm_panel_bridge_remove(bridge[i]);
clk_disable_unprepare(ldev->pixel_clk);
return ret;
}
void ltdc_unload(struct drm_device *ddev)
{
struct ltdc_device *ldev = ddev->dev_private;
int i;
DRM_DEBUG_DRIVER("\n");
for (i = 0; i < MAX_ENDPOINTS; i++)
drm_of_panel_bridge_remove(ddev->dev->of_node, 0, i);
clk_disable_unprepare(ldev->pixel_clk);
}
MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
MODULE_LICENSE("GPL v2");
