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drm/i915/dsi: Fix state mismatch warns for horizontal timings with DSC

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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@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/c2481aaf67ea396aa4698cd2d8e23d19ec4f4ecf.1575974743.git.jani.nikula@intel.com
This commit is contained in:
Vandita Kulkarni 2019-12-10 12:50:59 +02:00 • committed by Jani Nikula
parent 53693f02d8
commit c2bb35e99f
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/i915/display/icl_dsi.c
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@ -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)