drm/i915/display: Add upper limit check for pixel clock

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Add upper limit check for pixel clock for DISPLAY_VER >= 30.
Limits don't apply when DSC is enabled.

The helper returns the upper limit for the platforms, capped to the
max dotclock (khz).

For the currently supported versions of HDMI, pixel clock is already
limited to 600Mhz so nothing needs to be done there as of now.

v2:
 - Add this limit to the new helper.
v3:
 - Rename helper to intel_max_uncompressed_dotclock(). (Imre)
 - Limit only for PTL and cap the limit to max_dotclock. (Imre)

BSpec: 49199, 68912
Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260202103731.357416-17-ankit.k.nautiyal@intel.com

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This commit is contained in:

Chaitanya Kumar Borah 2026-02-02 16:07:30 +05:30 • committed by Ankit Nautiyal

parent a049ced86a

commit 50f5168775

3 changed files with 15 additions and 0 deletions

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11

drivers/gpu/drm/i915/display/intel_display.c

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1

drivers/gpu/drm/i915/display/intel_display.h

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3

drivers/gpu/drm/i915/display/intel_dp.c

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