From 7084e4a69777c93014498b62cc676f500c5cada3 Mon Sep 17 00:00:00 2001
From: Vandita Kulkarni <vandita.kulkarni@intel.com>
Date: Tue, 10 Dec 2019 12:50:59 +0200
Subject: drm/i915/dsi: Fix state mismatch warns for horizontal timings with
Git-commit: c2bb35e99f4b426efdd28011655bd67ca86749b5
Patch-mainline: v5.6-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
DSC
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
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
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)
--
2.28.0