[PATCH RFT 13/14] drm/msm/a6xx: Drop cfg->ubwc_swizzle override

[Konrad Dybcio]

On 5/9/25 3:17 PM, Konrad Dybcio wrote:
> On 5/8/25 9:26 PM, Connor Abbott wrote:
>> On Thu, May 8, 2025 at 2:14 PM Konrad Dybcio <konradybcio at kernel.org> wrote:
>>>
>>> From: Konrad Dybcio <konrad.dybcio at oss.qualcomm.com>
>>>
>>> On A663 (SA8775P) the value matches exactly.
>>>
>>> On A610, the value matches on SM6115, but is different on SM6125. That
>>> turns out not to be a problem, as the bits that differ aren't even
>>> interpreted.
>>
>> This is definitely going to break userspace, because the kernel
>> doesn't expose the UBWC version, instead exposing just the swizzle and
>> userspace expects that it sets the right value for older UBWC versions
>> before it became configurable (0x7 for UBWC 1.0 and 0x6 for 2.0-3.0).
>> It looks like the data for SM6125 is just wrong.
> 
> Oh that's sad.. I'll drop this commit

Wait uh, we have this data in the common config.. why would it break
userspace?

Konrad