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drm/i915/dp_mst: Fix symbol clock when calculating the DSC DPT bpp limit

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The expected link symbol clock unit when calculating the DSC DPT bpp
limit is kSymbols/sec, aligning with the dotclock's kPixels/sec unit
based on the crtc clock. As opposed to this port_clock is used - which
has a 10 kbits/sec unit - with the resulting symbol clock in 10
kSymbols/sec units (disregarding the rounding error for the 13.5Gbps
rate). Fix the calculation using the expected 10x factor.

Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240416221010.376865-3-imre.deak@intel.com
This commit is contained in:
Imre Deak 2024-04-17 01:10:01 +03:00
parent f1d6aec41f
commit 854ff3d9b8
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/i915/display/intel_dp_mst.c
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@ -58,8 +58,7 @@ static int intel_dp_mst_check_constraints(struct drm_i915_private *i915, int bpp
{
if (intel_dp_is_uhbr(crtc_state) && DISPLAY_VER(i915) < 14 && dsc) {
int output_bpp = bpp;
/* DisplayPort 2 128b/132b, bits per lane is always 32 */
int symbol_clock = crtc_state->port_clock / 32;
int symbol_clock = intel_dp_link_symbol_clock(crtc_state->port_clock);
if (output_bpp * adjusted_mode->crtc_clock >=
symbol_clock * 72) {