[PATCH 0/5] Add HDMI PLL Algorithm for SNPS/C10PHY

[Nautiyal, Ankit K]

On 1/22/2025 4:15 AM, Almahallawy, Khaled wrote:
> Thank You for the series.
> Tested a modeline that is not pre-computed and able to see pixel clock
> calculation done correctly and the analyzer turns on:
>
> adjusted mode: "3440x1440": 50 265250 3440 3488 3520 3600 1440 1443
> 1453 1474 0x48 0x9
> crtc timings: clock=265250, hd=3440 hb=3440-3600 hs=3488-3520 ht=3600,
> vd=1440 vb=1440-1474 vs=1443-1453 vt=1474, flags=0x9
>
> Tested-by: Khaled Almahallawy <khaled.almahallawy at intel.com>

Thanks Khaled for the testing.

Jani, does the series looks alright to merge?


Regards,

Ankit

>
> On Mon, 2025-01-20 at 09:51 +0530, Ankit Nautiyal wrote:
>> The HDMI PLL programming involves pre-calculated values for specific
>> frequencies and an algorithm to compute values for other frequencies.
>> While the algorithm itself wasn't part of the driver, tables were
>> added based on it for known modes.
>>
>> Some HDMI modes were pruned due to lack of support (for example
>> issues
>> [1],[2], and [3]).
>> This series adds the algorithm for computing HDMI PLLs for
>> SNPS/C10PHY
>> to work with all modes supported by the hardware.
>>
>> The original algorithm uses floating-point math, which has been
>> converted to integers while preserving precision. As a result,
>> the values in the existing computable tables are very close but not
>> exact. Testing with DG2 and MTL on various panels revealed no issues.
>>
>> [1] https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/9722
>> [2] https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/10654
>> [3] https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/10956
>>
>> Rev2:
>> -Change the name of the new file for HDMI PLL algorithm.
>> -Fix styling issues and bit refactoring for readbility.
>> -Fix issues reported by kernel test bot.
>>
>> Rev3:
>> -Modify the names of helper functions to align with filename.
>>
>> Rev4:
>> -Rebase, added Bspec references, and address review comments.
>>
>> Ankit Nautiyal (5):
>>    drm/i915/display: Add support for SNPS PHY HDMI PLL algorithm for
>> DG2
>>    drm/i915/snps_phy: Use HDMI PLL algorithm for DG2
>>    drm/i915/cx0_phy_regs: Add C10 registers bits
>>    drm/i915/intel_snps_hdmi_pll: Compute C10 HDMI PLLs with algorithm
>>    drm/i915/cx0_phy: Use HDMI PLL algorithm for C10 PHY
>>
>>   drivers/gpu/drm/i915/Makefile                 |   1 +
>>   drivers/gpu/drm/i915/display/intel_cx0_phy.c  |  49 +--
>>   drivers/gpu/drm/i915/display/intel_cx0_phy.h  |   1 -
>>   .../gpu/drm/i915/display/intel_cx0_phy_regs.h |  24 ++
>>   drivers/gpu/drm/i915/display/intel_hdmi.c     |  12 -
>>   .../drm/i915/display/intel_snps_hdmi_pll.c    | 364
>> ++++++++++++++++++
>>   .../drm/i915/display/intel_snps_hdmi_pll.h    |  17 +
>>   drivers/gpu/drm/i915/display/intel_snps_phy.c |  37 +-
>>   drivers/gpu/drm/i915/display/intel_snps_phy.h |   1 -
>>   drivers/gpu/drm/xe/Makefile                   |   1 +
>>   10 files changed, 427 insertions(+), 80 deletions(-)
>>   create mode 100644
>> drivers/gpu/drm/i915/display/intel_snps_hdmi_pll.c
>>   create mode 100644
>> drivers/gpu/drm/i915/display/intel_snps_hdmi_pll.h
>>