linux-kernel - Re: [PATCH v5 1/6] drm/msm/dpu: fix video mode DSC for DSI

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Date: Tue, 28 May 2024 14:16:37 -0700
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Jun Nie <jun.nie@...aro.org>, Rob Clark <robdclark@...il.com>,
        "Abhinav
 Kumar" <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Daniel
 Vetter" <daniel@...ll.ch>,
        Vinod Koul <vkoul@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        "Jonathan
 Marek" <jonathan@...ek.ca>
Subject: Re: [PATCH v5 1/6] drm/msm/dpu: fix video mode DSC for DSI



On 5/27/2024 7:21 AM, Jun Nie wrote:
> From: Jonathan Marek <jonathan@...ek.ca>
> 
> Add width change in DPU timing for DSC compression case to work with
> DSI video mode.

Hi Jun,

LGTM

Reviewed-by: Jessica Zhang <quic_jesszhan@...cinc.com>

Thanks,

Jessica Zhang

> 
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> Signed-off-by: Jun Nie <jun.nie@...aro.org>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c          |  2 +-
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h     |  8 ++++++++
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 18 ++++++++++++++++++
>   3 files changed, 27 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 119f3ea50a7c..48cef6e79c70 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -564,7 +564,7 @@ bool dpu_encoder_use_dsc_merge(struct drm_encoder *drm_enc)
>   	return (num_dsc > 0) && (num_dsc > intf_count);
>   }
>   
> -static struct drm_dsc_config *dpu_encoder_get_dsc_config(struct drm_encoder *drm_enc)
> +struct drm_dsc_config *dpu_encoder_get_dsc_config(struct drm_encoder *drm_enc)
>   {
>   	struct msm_drm_private *priv = drm_enc->dev->dev_private;
>   	struct dpu_encoder_virt *dpu_enc = to_dpu_encoder_virt(drm_enc);
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> index 002e89cc1705..2167c46c1a45 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> @@ -334,6 +334,14 @@ static inline enum dpu_3d_blend_mode dpu_encoder_helper_get_3d_blend_mode(
>    */
>   unsigned int dpu_encoder_helper_get_dsc(struct dpu_encoder_phys *phys_enc);
>   
> +/**
> + * dpu_encoder_get_dsc_config - get DSC config for the DPU encoder
> + *   This helper function is used by physical encoder to get DSC config
> + *   used for this encoder.
> + * @drm_enc: Pointer to encoder structure
> + */
> +struct drm_dsc_config *dpu_encoder_get_dsc_config(struct drm_encoder *drm_enc);
> +
>   /**
>    * dpu_encoder_get_drm_fmt - return DRM fourcc format
>    * @phys_enc: Pointer to physical encoder structure
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> index ef69c2f408c3..925ec6ada0e1 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> @@ -11,6 +11,7 @@
>   #include "dpu_trace.h"
>   #include "disp/msm_disp_snapshot.h"
>   
> +#include <drm/display/drm_dsc_helper.h>
>   #include <drm/drm_managed.h>
>   
>   #define DPU_DEBUG_VIDENC(e, fmt, ...) DPU_DEBUG("enc%d intf%d " fmt, \
> @@ -115,6 +116,23 @@ static void drm_mode_to_intf_timing_params(
>   		timing->h_front_porch = timing->h_front_porch >> 1;
>   		timing->hsync_pulse_width = timing->hsync_pulse_width >> 1;
>   	}
> +
> +	/*
> +	 * for DSI, if compression is enabled, then divide the horizonal active
> +	 * timing parameters by compression ratio. bits of 3 components(R/G/B)
> +	 * is compressed into bits of 1 pixel.
> +	 */
> +	if (phys_enc->hw_intf->cap->type != INTF_DP && timing->compression_en) {
> +		struct drm_dsc_config *dsc =
> +		       dpu_encoder_get_dsc_config(phys_enc->parent);
> +		/*
> +		 * TODO: replace drm_dsc_get_bpp_int with logic to handle
> +		 * fractional part if there is fraction
> +		 */
> +		timing->width = timing->width * drm_dsc_get_bpp_int(dsc) /
> +				(dsc->bits_per_component * 3);
> +		timing->xres = timing->width;
> +	}
>   }
>   
>   static u32 get_horizontal_total(const struct dpu_hw_intf_timing_params *timing)
> 
> -- 
> 2.34.1
>