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SubjectRe: [PATCH v2 13/14] drm/msm/a6xx: Add A619_holi speedbin support
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On 14/02/2023 19:31, Konrad Dybcio wrote:
> A619_holi is implemented on at least two SoCs: SM4350 (holi) and SM6375
> (blair). This is what seems to be a first occurrence of this happening,
> but it's easy to overcome by guarding the SoC-specific fuse values with
> of_machine_is_compatible(). Do just that to enable frequency limiting
> on these SoCs.
>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> ---
> drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 31 +++++++++++++++++++++++++++
> 1 file changed, 31 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index ffe0fd431a76..94b4d93619ed 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -2094,6 +2094,34 @@ static u32 a618_get_speed_bin(u32 fuse)
> return UINT_MAX;
> }
>
> +static u32 a619_holi_get_speed_bin(u32 fuse)
> +{
> + /*
> + * There are (at least) two SoCs implementing A619_holi: SM4350 (holi)
> + * and SM6375 (blair). Limit the fuse matching to the corresponding
> + * SoC to prevent bogus frequency setting (as improbable as it may be,
> + * given unexpected fuse values are.. unexpected! But still possible.)
> + */
> +
> + if (fuse == 0)
> + return 0;
> +
> + if (of_machine_is_compatible("qcom,sm4350")) {
> + if (fuse == 138)
> + return 1;
> + else if (fuse == 92)
> + return 2;
> + } else if (of_machine_is_compatible("qcom,sm6375")) {
> + if (fuse == 190)
> + return 1;
> + else if (fuse == 177)
> + return 2;

Ugh.

> + } else
> + pr_warn("Unknown SoC implementing A619_holi!\n");
> +
> + return UINT_MAX;
> +}
> +
> static u32 a619_get_speed_bin(u32 fuse)
> {
> if (fuse == 0)
> @@ -2153,6 +2181,9 @@ static u32 fuse_to_supp_hw(struct device *dev, struct adreno_rev rev, u32 fuse)
> if (adreno_cmp_rev(ADRENO_REV(6, 1, 8, ANY_ID), rev))
> val = a618_get_speed_bin(fuse);
>
> + else if (adreno_cmp_rev(ADRENO_REV(6, 1, 9, 1), rev))

I really think it begs to have && !of_find_property(dev->of_node,
"qcom,gmu") here.

> + val = a619_holi_get_speed_bin(fuse);
> +
> else if (adreno_cmp_rev(ADRENO_REV(6, 1, 9, ANY_ID), rev))
> val = a619_get_speed_bin(fuse);
>

--
With best wishes
Dmitry

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