From: Vandita Kulkarni <vandita.kulkarni@xxxxxxxxx>
When DSC is enabled consider the compression ratio that was used during
horizontal timing calculations.
This may still lead to warns due to rounding errors in the round-trip.
v2 by Jani:
- rebase on top of the more generic dsc state readout
Signed-off-by: Vandita Kulkarni <vandita.kulkarni@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/icl_dsi.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index caa477c4b1af..b1d775d834d4 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -1255,6 +1255,18 @@ static void gen11_dsi_get_timings(struct intel_encoder *encoder,
struct drm_display_mode *adjusted_mode =
&pipe_config->hw.adjusted_mode;
+ if (pipe_config->dsc.compressed_bpp) {
+ int div = pipe_config->dsc.compressed_bpp;
+ int mul = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
+
+ adjusted_mode->crtc_htotal =
+ DIV_ROUND_UP(adjusted_mode->crtc_htotal * mul, div);
+ adjusted_mode->crtc_hsync_start =
+ DIV_ROUND_UP(adjusted_mode->crtc_hsync_start * mul, div);
+ adjusted_mode->crtc_hsync_end =
+ DIV_ROUND_UP(adjusted_mode->crtc_hsync_end * mul, div);
+ }
+
if (intel_dsi->dual_link) {
adjusted_mode->crtc_hdisplay *= 2;
if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
--
2.20.1
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