linux-kernel - Re: [PATCH 02/14] drm/msm/a6xx: Extend UBWC config

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Message-ID: <3644f111-0d69-1006-f032-782e1b00cd17@quicinc.com>
Date:   Wed, 1 Feb 2023 15:00:53 +0530
From:   Akhil P Oommen <quic_akhilpo@...cinc.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <andersson@...nel.org>,
        <agross@...nel.org>, <krzysztof.kozlowski@...aro.org>
CC:     <marijn.suijten@...ainline.org>, Rob Clark <robdclark@...il.com>,
        "Abhinav Kumar" <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Chia-I Wu <olvaffe@...il.com>,
        Douglas Anderson <dianders@...omium.org>,
        <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/14] drm/msm/a6xx: Extend UBWC config

On 1/26/2023 8:46 PM, Konrad Dybcio wrote:
> Port setting min_access_length, ubwc_mode and upper_bit from downstream.
> Values were validated using downstream device trees for SM8[123]50 and
> left default (as per downstream) elsewhere.
>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 26 ++++++++++++++++++--------
>  1 file changed, 18 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index c5f5d0bb3fdc..ad5d791b804c 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -786,17 +786,22 @@ static void a6xx_set_cp_protect(struct msm_gpu *gpu)
>  static void a6xx_set_ubwc_config(struct msm_gpu *gpu)
>  {
>  	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
> -	u32 lower_bit = 2;
> +	u32 lower_bit = 1;
Wouldn't this break a630?

-Akhil.
> +	u32 upper_bit = 0;
>  	u32 amsbc = 0;
>  	u32 rgb565_predicator = 0;
>  	u32 uavflagprd_inv = 0;
> +	u32 min_acc_len = 0;
> +	u32 ubwc_mode = 0;
>  
>  	/* a618 is using the hw default values */
>  	if (adreno_is_a618(adreno_gpu))
>  		return;
>  
> -	if (adreno_is_a640_family(adreno_gpu))
> +	if (adreno_is_a640_family(adreno_gpu)) {
>  		amsbc = 1;
> +		lower_bit = 2;
> +	}
>  
>  	if (adreno_is_a650(adreno_gpu) || adreno_is_a660(adreno_gpu)) {
>  		/* TODO: get ddr type from bootloader and use 2 for LPDDR4 */
> @@ -807,18 +812,23 @@ static void a6xx_set_ubwc_config(struct msm_gpu *gpu)
>  	}
>  
>  	if (adreno_is_7c3(adreno_gpu)) {
> -		lower_bit = 1;
>  		amsbc = 1;
>  		rgb565_predicator = 1;
>  		uavflagprd_inv = 2;
>  	}
>  
>  	gpu_write(gpu, REG_A6XX_RB_NC_MODE_CNTL,
> -		rgb565_predicator << 11 | amsbc << 4 | lower_bit << 1);
> -	gpu_write(gpu, REG_A6XX_TPL1_NC_MODE_CNTL, lower_bit << 1);
> -	gpu_write(gpu, REG_A6XX_SP_NC_MODE_CNTL,
> -		uavflagprd_inv << 4 | lower_bit << 1);
> -	gpu_write(gpu, REG_A6XX_UCHE_MODE_CNTL, lower_bit << 21);
> +		  rgb565_predicator << 11 | upper_bit << 10 | amsbc << 4 |
> +		  min_acc_len << 3 | lower_bit << 1 | ubwc_mode);
> +
> +	gpu_write(gpu, REG_A6XX_TPL1_NC_MODE_CNTL, upper_bit << 4 |
> +		  min_acc_len << 3 | lower_bit << 1 | ubwc_mode);
> +
> +	gpu_write(gpu, REG_A6XX_SP_NC_MODE_CNTL, upper_bit << 10 |
> +		  uavflagprd_inv << 4 | min_acc_len << 3 |
> +		  lower_bit << 1 | ubwc_mode);
> +
> +	gpu_write(gpu, REG_A6XX_UCHE_MODE_CNTL, min_acc_len << 23 | lower_bit << 21);
>  }
>  
>  static int a6xx_cp_init(struct msm_gpu *gpu)