[PATCH 15/17] drm/msm/a6xx: Make crashstate capture IFPC safe

[Akhil P Oommen]

On 7/23/2025 4:02 PM, Konrad Dybcio wrote:
> On 7/20/25 2:16 PM, Akhil P Oommen wrote:
>> Now with IFPC, GX domain can collapse as soon as GPU becomes IDLE. So
>> add gx_is_on check before accessing any GX registers during crashstate
>> capture and recovery.
>>
>> Signed-off-by: Akhil P Oommen <akhilpo at oss.qualcomm.com>
>> ---
> 
> [...]
> 
>> +	/*
>> +	 * This is true only on an A6XX_GEN1 with GMU, has IFPC enabled and a super old SQE firmware
>> +	 * without 'whereami' support
>> +	 */
> 
> Firmware that old won't even be accepted by the driver, see the slightly
> confusing logic in a6xx_ucode_check_version()

hmm. you are right. In that case, I don't know why we still have the
below bit here:

	ring->memptrs->rptr = gpu_read(gpu, REG_A6XX_CP_RB_RPTR);

-Akhil

> 
> Konrad