linux-kernel - Re: [PATCH Resend v11 11/15] drm/msm/disp/dpu: get timing engine status from intf status register

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Message-ID: <157a5a24-6945-fdb4-194c-a18f969e2bd9@linaro.org>
Date:   Tue, 24 Jan 2023 02:24:07 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Vinod Polimera <quic_vpolimer@...cinc.com>,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, robdclark@...il.com,
        dianders@...omium.org, swboyd@...omium.org,
        quic_kalyant@...cinc.com, quic_khsieh@...cinc.com,
        quic_vproddut@...cinc.com, quic_bjorande@...cinc.com,
        quic_abhinavk@...cinc.com, quic_sbillaka@...cinc.com
Subject: Re: [PATCH Resend v11 11/15] drm/msm/disp/dpu: get timing engine
 status from intf status register

On 19/01/2023 16:26, Vinod Polimera wrote:
> Recommended way of reading the interface timing gen status is via
> status register. Timing gen status register will give a reliable status
> of the interface especially during ON/OFF transitions. This support was
> added from DPU version 5.0.0.

5.0.0 is sm8150. I have expected to see INTF_SC7180_MASK to be changed, 
while this patch for some reason changes only INTF_SC7280_MASK. Could 
you please clarify this?

> 
> Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c |  3 ++-
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 12 +++++++-----
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c    |  8 +++++++-
>   3 files changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> index 4375e72..0244a7b 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
> @@ -80,7 +80,8 @@
>   
>   #define INTF_SC7180_MASK BIT(DPU_INTF_INPUT_CTRL) | BIT(DPU_INTF_TE)
>   
> -#define INTF_SC7280_MASK INTF_SC7180_MASK | BIT(DPU_DATA_HCTL_EN)
> +#define INTF_SC7280_MASK \
> +	(INTF_SC7180_MASK | BIT(DPU_DATA_HCTL_EN) | BIT(DPU_INTF_STATUS_SUPPORTED))
>   
>   #define IRQ_SDM845_MASK (BIT(MDP_SSPP_TOP0_INTR) | \
>   			 BIT(MDP_SSPP_TOP0_INTR2) | \
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> index 978e3bd..79c18fe 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
> @@ -213,17 +213,19 @@ enum {
>   
>   /**
>    * INTF sub-blocks
> - * @DPU_INTF_INPUT_CTRL         Supports the setting of pp block from which
> - *                              pixel data arrives to this INTF
> - * @DPU_INTF_TE                 INTF block has TE configuration support
> - * @DPU_DATA_HCTL_EN            Allows data to be transferred at different rate
> -                                than video timing
> + * @DPU_INTF_INPUT_CTRL             Supports the setting of pp block from which
> + *                                  pixel data arrives to this INTF
> + * @DPU_INTF_TE                     INTF block has TE configuration support
> + * @DPU_DATA_HCTL_EN                Allows data to be transferred at different rate
> + *                                  than video timing
> + * @DPU_INTF_STATUS_SUPPORTED       INTF block has INTF_STATUS register
>    * @DPU_INTF_MAX
>    */
>   enum {
>   	DPU_INTF_INPUT_CTRL = 0x1,
>   	DPU_INTF_TE,
>   	DPU_DATA_HCTL_EN,
> +	DPU_INTF_STATUS_SUPPORTED,
>   	DPU_INTF_MAX
>   };
>   
> 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 7ce66bf..84ee2ef 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
> @@ -62,6 +62,7 @@
>   #define   INTF_LINE_COUNT               0x0B0
>   
>   #define   INTF_MUX                      0x25C
> +#define   INTF_STATUS                   0x26C
>   
>   #define INTF_CFG_ACTIVE_H_EN	BIT(29)
>   #define INTF_CFG_ACTIVE_V_EN	BIT(30)
> @@ -297,8 +298,13 @@ static void dpu_hw_intf_get_status(
>   		struct intf_status *s)
>   {
>   	struct dpu_hw_blk_reg_map *c = &intf->hw;
> +	unsigned long cap = intf->cap->features;
> +
> +	if (cap & BIT(DPU_INTF_STATUS_SUPPORTED))
> +		s->is_en = DPU_REG_READ(c, INTF_STATUS) & BIT(0);
> +	else
> +		s->is_en = DPU_REG_READ(c, INTF_TIMING_ENGINE_EN);
>   
> -	s->is_en = DPU_REG_READ(c, INTF_TIMING_ENGINE_EN);
>   	s->is_prog_fetch_en = !!(DPU_REG_READ(c, INTF_CONFIG) & BIT(31));
>   	if (s->is_en) {
>   		s->frame_count = DPU_REG_READ(c, INTF_FRAME_COUNT);

-- 
With best wishes
Dmitry