Re: [PATCH 2/7] drm/msm/adreno: Add ZAP firmware name to A635

[Konrad Dybcio <konrad.dybcio@linaro.org>]

On 10/17/23 09:33, Rob Clark wrote:
> On Mon, Oct 16, 2023 at 1:12 PM Akhil P Oommen <quic_akhilpo@quicinc.com> wrote:
>>
>> On Tue, Sep 26, 2023 at 08:24:37PM +0200, Konrad Dybcio wrote:
>>>
>>> Some (many?) devices with A635 expect a ZAP shader to be loaded.
>>>
>>> Set the file name to allow for that.
>>>
>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
>>> ---
>>>   drivers/gpu/drm/msm/adreno/adreno_device.c | 1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c
>>> index fa527935ffd4..16527fe8584d 100644
>>> --- a/drivers/gpu/drm/msm/adreno/adreno_device.c
>>> +++ b/drivers/gpu/drm/msm/adreno/adreno_device.c
>>> @@ -454,6 +454,7 @@ static const struct adreno_info gpulist[] = {
>>>                .quirks = ADRENO_QUIRK_HAS_CACHED_COHERENT |
>>>                        ADRENO_QUIRK_HAS_HW_APRIV,
>>>                .init = a6xx_gpu_init,
>>> +             .zapfw = "a660_zap.mbn",
>>
>> sc7280 doesn't have a TZ and so no zap shader support. Can we handle
>> this using "firmware-name" property in your top level platform dt? Zap
>> firmwares are signed with different keys for each OEMs. So there is
>> cross-compatibility anyway.
> 
> I think this ends up working out because the version of sc7280 that
> doesn't have TZ also doesn't have the associated mem-region/etc..
Yes

> but
> maybe we should deprecate the zapfw field as in practice it isn't
> useful (ie. always overriden by firmware-name).
Also yes, we've discussed that on IRC once

> 
> Fwiw there are windows laptops with sc7180/sc7280 which do use zap fw.
Correct, e.g. the SC7180 Acer Aspire 1 that is supported upstream.

Konrad

Konrad