linux-kernel - Re: [PATCH 2/3] drm/msm/dpu: Set DATABUS

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Message-ID: <c74c9e0e-d059-f0e3-4350-03089c37131a@linaro.org>
Date:   Wed, 14 Jun 2023 10:56:02 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Jessica Zhang <quic_jesszhan@...cinc.com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     quic_abhinavk@...cinc.com, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] drm/msm/dpu: Set DATABUS_WIDEN on command mode
 encoders

On 14/06/2023 04:57, Jessica Zhang wrote:
> Add a DPU INTF op to set the DATABUS_WIDEN register to enable the
> databus-widen mode datapath.
> 
> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c |  3 +++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c          | 12 ++++++++++++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h          |  3 +++
>   3 files changed, 18 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> index b856c6286c85..124ba96bebda 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
> @@ -70,6 +70,9 @@ static void _dpu_encoder_phys_cmd_update_intf_cfg(
>   
>   	if (intf_cfg.dsc != 0 && phys_enc->hw_intf->ops.enable_compression)
>   		phys_enc->hw_intf->ops.enable_compression(phys_enc->hw_intf);
> +
> +	if (phys_enc->hw_intf->ops.enable_widebus)
> +		phys_enc->hw_intf->ops.enable_widebus(phys_enc->hw_intf);

No. Please provide a single function which takes necessary 
configuration, including compression and wide_bus_enable.

Also note, that we already have dpu_encoder_is_widebus_enabled() and the 
rest of support code. Please stick to it too.

>   }
>   
>   static void dpu_encoder_phys_cmd_pp_tx_done_irq(void *arg, int irq_idx)
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> index 5b0f6627e29b..03ba3a1c7a46 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> @@ -513,6 +513,15 @@ static void dpu_hw_intf_disable_autorefresh(struct dpu_hw_intf *intf,
>   
>   }
>   
> +static void dpu_hw_intf_enable_widebus(struct dpu_hw_intf *ctx)
> +{
> +	u32 intf_cfg2 = DPU_REG_READ(&ctx->hw, INTF_CONFIG2);
> +
> +	intf_cfg2 |= INTF_CFG2_DATABUS_WIDEN;
> +
> +	DPU_REG_WRITE(&ctx->hw, INTF_CONFIG2, intf_cfg2);
> +}
> +
>   static void dpu_hw_intf_enable_compression(struct dpu_hw_intf *ctx)
>   {
>   	u32 intf_cfg2 = DPU_REG_READ(&ctx->hw, INTF_CONFIG2);
> @@ -545,6 +554,9 @@ static void _setup_intf_ops(struct dpu_hw_intf_ops *ops,
>   
>   	if (cap & BIT(DPU_INTF_DATA_COMPRESS))
>   		ops->enable_compression = dpu_hw_intf_enable_compression;
> +
> +	if (cap & BIT(DPU_INTF_DATABUS_WIDEN))
> +		ops->enable_widebus = dpu_hw_intf_enable_widebus;

>   }
>   
>   struct dpu_hw_intf *dpu_hw_intf_init(const struct dpu_intf_cfg *cfg,
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> index 99e21c4137f9..64a17b99d3d1 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
> @@ -71,6 +71,7 @@ struct intf_status {
>    *                              Return: 0 on success, -ETIMEDOUT on timeout
>    * @vsync_sel:                  Select vsync signal for tear-effect configuration
>    * @enable_compression:         Enable data compression
> + * @enable_widebus:             Enable widebus
>    */
>   struct dpu_hw_intf_ops {
>   	void (*setup_timing_gen)(struct dpu_hw_intf *intf,
> @@ -109,6 +110,8 @@ struct dpu_hw_intf_ops {
>   	void (*disable_autorefresh)(struct dpu_hw_intf *intf, uint32_t encoder_id, u16 vdisplay);
>   
>   	void (*enable_compression)(struct dpu_hw_intf *intf);
> +
> +	void (*enable_widebus)(struct dpu_hw_intf *intf);
>   };
>   
>   struct dpu_hw_intf {
> 

-- 
With best wishes
Dmitry