[PATCH v2] drm/msm: adreno: a6xx: enable GMU bandwidth voting for x1e80100 GPU

[Akhil P Oommen]

On 7/25/2025 2:05 PM, Neil Armstrong wrote:
> The Adreno GPU Management Unit (GMU) can also scale DDR Bandwidth along
> the Frequency and Power Domain level, but by default we leave the
> OPP core scale the interconnect ddr path.
> 
> Declare the Bus Control Modules (BCMs) and the corresponding parameters
> in the GPU info struct to allow the GMU to vote for the bandwidth.
> 
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at oss.qualcomm.com>
> Signed-off-by: Neil Armstrong <neil.armstrong at linaro.org>

Reviewed-by: Akhil P Oommen <akhilpo at oss.qualcomm.com>

-Akhil

> ---
> Changes in v2:
> - Used proper ACV perfmode bit/freq
> - Link to v1: https://lore.kernel.org/r/20250721-topic-x1e80100-gpu-bwvote-v1-1-946619b0f73a@linaro.org
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_catalog.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_catalog.c b/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> index 00e1afd46b81546eec03e22cda9e9a604f6f3b60..892f98b1f2ae582268adebd758437ff60456cdd5 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_catalog.c
> @@ -1440,6 +1440,17 @@ static const struct adreno_info a7xx_gpus[] = {
>  			.pwrup_reglist = &a7xx_pwrup_reglist,
>  			.gmu_chipid = 0x7050001,
>  			.gmu_cgc_mode = 0x00020202,
> +			.bcms = (const struct a6xx_bcm[]) {
> +				{ .name = "SH0", .buswidth = 16 },
> +				{ .name = "MC0", .buswidth = 4 },
> +				{
> +					.name = "ACV",
> +					.fixed = true,
> +					.perfmode = BIT(3),
> +					.perfmode_bw = 16500000,
> +				},
> +				{ /* sentinel */ },
> +			},
>  		},
>  		.preempt_record_size = 4192 * SZ_1K,
>  		.speedbins = ADRENO_SPEEDBINS(
> 
> ---
> base-commit: 97987520025658f30bb787a99ffbd9bbff9ffc9d
> change-id: 20250721-topic-x1e80100-gpu-bwvote-9fc4690fe5e3
> 
> Best regards,