Re: [PATCH v2 0/8] DP-HDMI PCON DSC fixes

["Nautiyal, Ankit K" <ankit.k.nautiyal@intel.com>]

On 8/21/2026 5:08 PM, Sharma, Swati2 wrote:
>
> Hi Ankit,
>
> Tested on the NVL platform using the AORUS FO32U2P panel and a BizLink 
> (DP to HDMI2.1) dongle.
> With your patches, I am now able to achieve 3840x2160 @ 240Hz, which 
> was previously being
> rejected with a CLOCK_HIGH error without the patches.
>
> Tested-by: Swati Sharma <swati2.sharma@intel.com>
>
Thanks Swati for testing the series and providing your tested-by!


Alex,

Since we discussed converging our work on these paths a while back [1],

I wanted to check if you've had a chance to test this series on your 
Panther Lake / VMM7100 setup, or if you still intend to do so?

Your validation/coverage on the PCON DSC and FRL paths would be great to 
have before we merge.

Thanks,

Ankit


[1] 
https://lore.kernel.org/intel-gfx/20260703232737.4433-1-alexander.kaplan@sms-medipool.de/


> On 11-08-2026 10:12 am, Ankit Nautiyal wrote:
>> The PCON mode_valid path currently does not fully account for the bandwidth
>> limitations of the PCON <-> HDMI link. The DSC capability between the
>> PCON and the HDMI sink also needs to be taken into account, which currently
>> isn't. Furthermore, the compressed bpp chosen needs to fit the
>> FRL configuration, which is also missing.
>>
>> This series:
>>   - reworks the HDMI DSC helpers so they can be reused across the
>>     mode_valid, compute_config and FRL bandwidth check paths
>>   - fixes the FRL/TMDS downstream bandwidth checks, and allows
>>     PCON DSC modes through the FRL check
>>   - Clamps the programmed DSC bpp to the FRL link bandwidth.
>>
>> Rev2:
>>   - Rebase and address comments from Suraj.
>>   - Drop drm/i915/dp: Use FRL pair check for the DFP dotclock limit as no
>>     longer required.
>>
>> Ankit Nautiyal (8):
>>    drm/i915/hdmi: Split the intel_hdmi_dsc_get_bpp()
>>    drm/i915/dp: Fix FRL BW check for HDMI2.1 DFP
>>    drm/i915/dp: Add a wrapper to check frl/tmds downstream constraints
>>    drm/i915/dp: Use the common downstream bw check in compute_bpc
>>    drm/i915/hdmi: Expose DSC min/max bpp helpers
>>    drm/i915/hdmi: Add helper to check if DSC chunksize fits the sink
>>      limits
>>    drm/i915/dp: Allow PCON DSC modes through FRL bw check
>>    drm/i915/dp: Clamp PCON DSC bpp to the FRL link bandwidth
>>
>>   drivers/gpu/drm/i915/display/intel_dp.c   | 144 ++++++++++++++++++----
>>   drivers/gpu/drm/i915/display/intel_hdmi.c | 124 ++++++++++++++-----
>>   drivers/gpu/drm/i915/display/intel_hdmi.h |   7 +-
>>   3 files changed, 218 insertions(+), 57 deletions(-)
>>