diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_pm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pm.c | 73 |
1 files changed, 70 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 4e0a952e176f..ceb1eecd9dad 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -26,6 +26,7 @@ */ #include <linux/cpufreq.h> +#include <drm/drm_plane_helper.h> #include "i915_drv.h" #include "intel_drv.h" #include "../../../platform/x86/intel_ips.h" @@ -2949,6 +2950,46 @@ void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv, } } +/* + * Determines the downscale amount of a plane for the purposes of watermark calculations. + * The bspec defines downscale amount as: + * + * """ + * Horizontal down scale amount = maximum[1, Horizontal source size / + * Horizontal destination size] + * Vertical down scale amount = maximum[1, Vertical source size / + * Vertical destination size] + * Total down scale amount = Horizontal down scale amount * + * Vertical down scale amount + * """ + * + * Return value is provided in 16.16 fixed point form to retain fractional part. + * Caller should take care of dividing & rounding off the value. + */ +static uint32_t +skl_plane_downscale_amount(const struct intel_plane_state *pstate) +{ + uint32_t downscale_h, downscale_w; + uint32_t src_w, src_h, dst_w, dst_h; + + if (WARN_ON(!pstate->visible)) + return DRM_PLANE_HELPER_NO_SCALING; + + /* n.b., src is 16.16 fixed point, dst is whole integer */ + src_w = drm_rect_width(&pstate->src); + src_h = drm_rect_height(&pstate->src); + dst_w = drm_rect_width(&pstate->dst); + dst_h = drm_rect_height(&pstate->dst); + if (intel_rotation_90_or_270(pstate->base.rotation)) + swap(dst_w, dst_h); + + downscale_h = max(src_h / dst_h, (uint32_t)DRM_PLANE_HELPER_NO_SCALING); + downscale_w = max(src_w / dst_w, (uint32_t)DRM_PLANE_HELPER_NO_SCALING); + + /* Provide result in 16.16 fixed point */ + return (uint64_t)downscale_w * downscale_h >> 16; +} + static unsigned int skl_plane_relative_data_rate(const struct intel_crtc_state *cstate, const struct drm_plane_state *pstate, @@ -3285,6 +3326,30 @@ static uint32_t skl_wm_method2(uint32_t pixel_rate, uint32_t pipe_htotal, return ret; } +static uint32_t skl_adjusted_plane_pixel_rate(const struct intel_crtc_state *cstate, + struct intel_plane_state *pstate) +{ + uint64_t adjusted_pixel_rate; + uint64_t downscale_amount; + uint64_t pixel_rate; + + /* Shouldn't reach here on disabled planes... */ + if (WARN_ON(!pstate->visible)) + return 0; + + /* + * Adjusted plane pixel rate is just the pipe's adjusted pixel rate + * with additional adjustments for plane-specific scaling. + */ + adjusted_pixel_rate = skl_pipe_pixel_rate(cstate); + downscale_amount = skl_plane_downscale_amount(pstate); + + pixel_rate = adjusted_pixel_rate * downscale_amount >> 16; + WARN_ON(pixel_rate != clamp_t(uint32_t, pixel_rate, 0, ~0)); + + return pixel_rate; +} + static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv, struct intel_crtc_state *cstate, struct intel_plane_state *intel_pstate, @@ -3303,6 +3368,7 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv, uint32_t selected_result; uint8_t cpp; uint32_t width = 0, height = 0; + uint32_t plane_pixel_rate; if (latency == 0 || !cstate->base.active || !intel_pstate->visible) { *enabled = false; @@ -3316,9 +3382,10 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv, swap(width, height); cpp = drm_format_plane_cpp(fb->pixel_format, 0); - method1 = skl_wm_method1(skl_pipe_pixel_rate(cstate), - cpp, latency); - method2 = skl_wm_method2(skl_pipe_pixel_rate(cstate), + plane_pixel_rate = skl_adjusted_plane_pixel_rate(cstate, intel_pstate); + + method1 = skl_wm_method1(plane_pixel_rate, cpp, latency); + method2 = skl_wm_method2(plane_pixel_rate, cstate->base.adjusted_mode.crtc_htotal, width, cpp, |