Re: [PATCH v2 1/6] drm/msm/a6xx: Add support for Adreno 612

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 11/6/25 9:50 PM, Akhil P Oommen wrote:
> From: Jie Zhang <quic_jiezh@quicinc.com>
> 
> Add support for Adreno 612 GPU found in SM6150/QCS615 chipsets.
> A612 falls under ADRENO_6XX_GEN1 family and is a cut down version
> of A615 GPU.
> 
> A612 has a new IP called Reduced Graphics Management Unit or RGMU
> which is a small state machine which helps to toggle GX GDSC
> (connected to CX rail) to implement IFPC feature. It doesn't support
> any other features of a full fledged GMU like clock control, resource
> voting to rpmh etc. So we need linux clock driver support like other
> gmu-wrapper implementations to control gpu core clock and gpu GX gdsc.
> This patch skips RGMU core initialization and act more like a
> gmu-wrapper case.
> 
> Signed-off-by: Jie Zhang <quic_jiezh@quicinc.com>
> Signed-off-by: Akhil P Oommen <akhilpo@oss.qualcomm.com>
> ---

[...]

>  	/* Enable fault detection */
> -	if (adreno_is_a730(adreno_gpu) ||
> +	if (adreno_is_a612(adreno_gpu) ||
> +	    adreno_is_a730(adreno_gpu) ||
>  	    adreno_is_a740_family(adreno_gpu))
>  		gpu_write(gpu, REG_A6XX_RBBM_INTERFACE_HANG_INT_CNTL, (1 << 30) | 0xcfffff);

Downstream sets this to 0x3fffff, but IDK if having a timeout too
large is an issue

Konrad