linux-kernel - Re: [PATCH v2 1/2] drm/msm/dpu: Add a function to retrieve the current CTL status

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Message-ID: <9e2c9151-d460-14d6-46f7-bc32b60ec4ca@linaro.org>
Date:   Fri, 18 Feb 2022 22:27:45 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>, robdclark@...il.com
Cc:     sean@...rly.run, airlied@...ux.ie, daniel@...ll.ch,
        abhinavk@...eaurora.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, konrad.dybcio@...ainline.org,
        marijn.suijten@...ainline.org, martin.botka@...ainline.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        paul.bouchara@...ainline.org
Subject: Re: [PATCH v2 1/2] drm/msm/dpu: Add a function to retrieve the
 current CTL status

On 11/09/2021 19:39, AngeloGioacchino Del Regno wrote:
> Add a function that returns whether the requested CTL is active or not:
> this will be used in a later commit to fix command mode panel issues.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c | 6 ++++++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h | 7 +++++++
>   2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> index 64740ddb983e..3b6fd73eb3a8 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
> @@ -91,6 +91,11 @@ static inline void dpu_hw_ctl_trigger_start(struct dpu_hw_ctl *ctx)
>   	DPU_REG_WRITE(&ctx->hw, CTL_START, 0x1);
>   }
>   
> +static inline bool dpu_hw_ctl_is_started(struct dpu_hw_ctl *ctx)
> +{
> +	return !!(DPU_REG_READ(&ctx->hw, CTL_START) & BIT(0));
> +}
> +
>   static inline void dpu_hw_ctl_trigger_pending(struct dpu_hw_ctl *ctx)
>   {
>   	trace_dpu_hw_ctl_trigger_prepare(ctx->pending_flush_mask,
> @@ -579,6 +584,7 @@ static void _setup_ctl_ops(struct dpu_hw_ctl_ops *ops,
>   	ops->get_pending_flush = dpu_hw_ctl_get_pending_flush;
>   	ops->get_flush_register = dpu_hw_ctl_get_flush_register;
>   	ops->trigger_start = dpu_hw_ctl_trigger_start;
> +	ops->is_started = dpu_hw_ctl_is_started;
>   	ops->trigger_pending = dpu_hw_ctl_trigger_pending;
>   	ops->reset = dpu_hw_ctl_reset_control;
>   	ops->wait_reset_status = dpu_hw_ctl_wait_reset_status;
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> index 806c171e5df2..ac1544474022 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.h
> @@ -61,6 +61,13 @@ struct dpu_hw_ctl_ops {
>   	 */
>   	void (*trigger_start)(struct dpu_hw_ctl *ctx);
>   
> +	/**
> +	 * check if the ctl is started
> +	 * @ctx       : ctl path ctx pointer
> +	 * @Return: true if started, false if stopped
> +	 */
> +	bool (*is_started)(struct dpu_hw_ctl *ctx);
> +
>   	/**
>   	 * kickoff prepare is in progress hw operation for sw
>   	 * controlled interfaces: DSI cmd mode and WB interface


-- 
With best wishes
Dmitry