[PATCH] drm/i915/gmbus: Add Wa_16025573575 for PTL for bit-bashing

[Nautiyal, Ankit K]

On 6/13/2025 2:43 PM, Jani Nikula wrote:
> On Fri, 13 Jun 2025, "Nautiyal, Ankit K" <ankit.k.nautiyal at intel.com> wrote:
>> On 6/12/2025 5:30 PM, Gustavo Sousa wrote:
>>> Instead of open-coding the conditions for the workaround in three
>>> different places in the file, I think we should have a function
>>> needs_wa_16025573575() and use it.
>>>
>>> Also, note that the workaround is also required for WCL (display version
>>> 30.02), and we would then include that in needs_wa_16025573575().
>> I agree, will make a separate function needs_wa_16025573575().
>>
>> Thanks for the suggestions. I will make suggested changes in next revision.
> Please let's aim for something a little more generic and unified than
> that, and one that can be easily extended and switched to a generated
> version in the future.


Hmm. I had sent something like that for another WA. I think I jumped the 
gun at that time by using the XE_WA framework directly :) [1]

I can make the suggested changes and send again.

[1] https://patchwork.freedesktop.org/patch/612661/?series=138257&rev=1


Regards,

Ankit

>
> intel_display_wa.h:
>
> enum intel_display_wa {
> 	INTEL_DISPLAY_WA_16025573575,
> };
>
> bool __intel_display_wa(struct intel_display *display, enum intel_display_wa wa);
>
> #define intel_display_wa(__display, __wa) __intel_display_wa((__display), INTEL_DISPLAY_WA_ ## __wa)
>
> In code you'd use:
>
> 	if (intel_display_wa(display, 16025573575))
>
> For now, you'd manually check for each enum in __intel_display_wa()
> implementation, but in the future that code could be generated similar
> to what xe currently has. I'm just not very enthusiastic about adding C
> language hostprogs with custom .rules files and parsing.
>
>
> BR,
> Jani.
>
>