linux-kernel - Re: [PATCH v1 2/3] drm/msm/adreno: Add support for X185 GPU

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Date: Mon, 24 Jun 2024 15:53:48 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Akhil P Oommen <quic_akhilpo@...cinc.com>,
 freedreno <freedreno@...ts.freedesktop.org>,
 dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
 Rob Clark <robdclark@...il.com>, Bjorn Andersson <andersson@...nel.org>
Cc: Abhinav Kumar <quic_abhinavk@...cinc.com>, Daniel Vetter
 <daniel@...ll.ch>, David Airlie <airlied@...il.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Marijn Suijten <marijn.suijten@...ainline.org>, Sean Paul <sean@...rly.run>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/3] drm/msm/adreno: Add support for X185 GPU



On 6/23/24 13:06, Akhil P Oommen wrote:
> Add support in drm/msm driver for the Adreno X185 gpu found in
> Snapdragon X1 Elite chipset.
> 
> Signed-off-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
> ---
> 
>   drivers/gpu/drm/msm/adreno/a6xx_gmu.c      | 19 +++++++++++++++----
>   drivers/gpu/drm/msm/adreno/a6xx_gpu.c      |  6 ++----
>   drivers/gpu/drm/msm/adreno/adreno_device.c | 14 ++++++++++++++
>   drivers/gpu/drm/msm/adreno/adreno_gpu.h    |  5 +++++
>   4 files changed, 36 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index 0e3dfd4c2bc8..168a4bddfaf2 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -830,8 +830,10 @@ static int a6xx_gmu_fw_start(struct a6xx_gmu *gmu, unsigned int state)
>   	 */
>   	gmu_write(gmu, REG_A6XX_GMU_CM3_CFG, 0x4052);
>   
> +	if (adreno_is_x185(adreno_gpu)) {
> +		chipid = 0x7050001;

What's wrong with using the logic below?

>   	/* NOTE: A730 may also fall in this if-condition with a future GMU fw update. */
> -	if (adreno_is_a7xx(adreno_gpu) && !adreno_is_a730(adreno_gpu)) {
> +	} else if (adreno_is_a7xx(adreno_gpu) && !adreno_is_a730(adreno_gpu)) {
>   		/* A7xx GPUs have obfuscated chip IDs. Use constant maj = 7 */
>   		chipid = FIELD_PREP(GENMASK(31, 24), 0x7);
>   
> @@ -1329,9 +1331,18 @@ static int a6xx_gmu_rpmh_arc_votes_init(struct device *dev, u32 *votes,
>   	if (!pri_count)
>   		return -EINVAL;
>   
> -	sec = cmd_db_read_aux_data("mx.lvl", &sec_count);
> -	if (IS_ERR(sec))
> -		return PTR_ERR(sec);
> +	/*
> +	 * Some targets have a separate gfx mxc rail. So try to read that first and then fall back
> +	 * to regular mx rail if it is missing
> +	 */
> +	sec = cmd_db_read_aux_data("gmxc.lvl", &sec_count);
> +	if (PTR_ERR_OR_ZERO(sec) == -EPROBE_DEFER) {
> +		return -EPROBE_DEFER;
> +	} else if (IS_ERR(sec)) {
> +		sec = cmd_db_read_aux_data("mx.lvl", &sec_count);
> +		if (IS_ERR(sec))
> +			return PTR_ERR(sec);
> +	}

I assume GMXC would always be used if present, although please use the
approach Dmitry suggested


The rest looks good!

Konrad