diff options
| author | Madhav Chauhan | 2018-09-16 12:53:26 +0200 |
|---|---|---|
| committer | Jani Nikula | 2018-09-24 16:19:47 +0200 |
| commit | ba3df888be909a8850e695a3d9631cfb49afede2 (patch) | |
| tree | bfac3b78cda83a713203d7bf8e7ecbd8a9d8dbf3 /drivers/gpu/drm/i915/icl_dsi.c | |
| parent | drm/i915/icl: DSI vswing programming sequence (diff) | |
| download | kernel-qcow2-linux-ba3df888be909a8850e695a3d9631cfb49afede2.tar.gz kernel-qcow2-linux-ba3df888be909a8850e695a3d9631cfb49afede2.tar.xz kernel-qcow2-linux-ba3df888be909a8850e695a3d9631cfb49afede2.zip | |
drm/i915/icl: Enable DDI Buffer
This patch enables DDI buffer by writing to DDI_BUF_CTL
register and wait for DDI status to be *not idle* for a
port.
v2: Rebase
v3: Remove step hard coding comments (Jani N)
Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1537095223-5184-4-git-send-email-madhav.chauhan@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/icl_dsi.c')
| -rw-r--r-- | drivers/gpu/drm/i915/icl_dsi.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c index e5c18a8e6458..190316c4c4c2 100644 --- a/drivers/gpu/drm/i915/icl_dsi.c +++ b/drivers/gpu/drm/i915/icl_dsi.c @@ -258,6 +258,25 @@ static void gen11_dsi_voltage_swing_program_seq(struct intel_encoder *encoder) } } +static void gen11_dsi_enable_ddi_buffer(struct intel_encoder *encoder) +{ + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); + struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base); + u32 tmp; + enum port port; + + for_each_dsi_port(port, intel_dsi->ports) { + tmp = I915_READ(DDI_BUF_CTL(port)); + tmp |= DDI_BUF_CTL_ENABLE; + I915_WRITE(DDI_BUF_CTL(port), tmp); + + if (wait_for_us(!(I915_READ(DDI_BUF_CTL(port)) & + DDI_BUF_IS_IDLE), + 500)) + DRM_ERROR("DDI port:%c buffer idle\n", port_name(port)); + } +} + static void gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder) { /* step 4a: power up all lanes of the DDI used by DSI */ @@ -268,6 +287,9 @@ static void gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder) /* step 4c: configure voltage swing and skew */ gen11_dsi_voltage_swing_program_seq(encoder); + + /* enable DDI buffer */ + gen11_dsi_enable_ddi_buffer(encoder); } static void __attribute__((unused)) |