linux-kernel - Re: [PATCH] drm/amd/display: Add pixel encoding info to debugfs

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Date: Mon, 20 May 2024 20:35:06 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Rino Andre Johnsen <rinoandrejohnsen@...il.com>, alexander.deucher@....com
Cc: Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>,
 Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
 Christian König <christian.koenig@....com>,
 "Pan, Xinhui" <Xinhui.Pan@....com>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>, Aurabindo Pillai
 <aurabindo.pillai@....com>, Hamza Mahfooz <hamza.mahfooz@....com>,
 Wayne Lin <wayne.lin@....com>, Hersen Wu <hersenxs.wu@....com>,
 Srinivasan Shanmugam <srinivasan.shanmugam@....com>,
 Fangzhi Zuo <jerry.zuo@....com>, Tom Chung <chiahsuan.chung@....com>,
 Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
 amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amd/display: Add pixel encoding info to debugfs

On 5/20/2024 16:07, Rino Andre Johnsen wrote:
> [Why]
> For debugging and testing purposes.
> 
> [How]
> Create amdgpu_current_pixelencoding debugfs entry.
> Usage: cat /sys/kernel/debug/dri/1/crtc-0/amdgpu_current_pixelencoding
> 
> Signed-off-by: Rino Andre Johnsen <rinoandrejohnsen@...il.com>
> ---
>   .../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 47 +++++++++++++++++++
>   1 file changed, 47 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> index 27d5c6077630..d275e5522335 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> @@ -1160,6 +1160,51 @@ static int amdgpu_current_colorspace_show(struct seq_file *m, void *data)
>   }
>   DEFINE_SHOW_ATTRIBUTE(amdgpu_current_colorspace);
>   
> +/*
> + * Returns the current pixelencoding for the crtc.
> + * Example usage: cat /sys/kernel/debug/dri/0/crtc-0/amdgpu_current_pixelencoding
> + */
> +static int amdgpu_current_pixelencoding_show(struct seq_file *m, void *data)
> +{
> +	struct drm_crtc *crtc = m->private;
> +	struct drm_device *dev = crtc->dev;
> +	struct dm_crtc_state *dm_crtc_state = NULL;

There is no need to initialize dm_crtc_state to NULL.  You set it before 
its first use.

> +	int res = -ENODEV;
> +
> +	mutex_lock(&dev->mode_config.mutex);
> +	drm_modeset_lock(&crtc->mutex, NULL);
> +	if (crtc->state == NULL)
> +		goto unlock;
> +
> +	dm_crtc_state = to_dm_crtc_state(crtc->state);
> +	if (dm_crtc_state->stream == NULL)
> +		goto unlock;
> +
> +	switch (dm_crtc_state->stream->timing.pixel_encoding) {
> +	case PIXEL_ENCODING_RGB:
> +		seq_puts(m, "RGB");
> +		break;
> +	case PIXEL_ENCODING_YCBCR422:
> +		seq_puts(m, "YCBCR422");
> +		break;
> +	case PIXEL_ENCODING_YCBCR444:
> +		seq_puts(m, "YCBCR444");
> +		break;
> +	case PIXEL_ENCODING_YCBCR420:
> +		seq_puts(m, "YCBCR420");
> +		break;
> +	default:
> +		goto unlock;
> +	}
> +	res = 0;
> +
> +unlock:
> +	drm_modeset_unlock(&crtc->mutex);
> +	mutex_unlock(&dev->mode_config.mutex);
> +
> +	return res;
> +}
> +DEFINE_SHOW_ATTRIBUTE(amdgpu_current_pixelencoding);
>   
>   /*
>    * Example usage:
> @@ -3688,6 +3733,8 @@ void crtc_debugfs_init(struct drm_crtc *crtc)
>   			    crtc, &amdgpu_current_bpc_fops);
>   	debugfs_create_file("amdgpu_current_colorspace", 0644, crtc->debugfs_entry,
>   			    crtc, &amdgpu_current_colorspace_fops);
> +	debugfs_create_file("amdgpu_current_pixelencoding", 0644, crtc->debugfs_entry,
> +			    crtc, &amdgpu_current_pixelencoding_fops);
>   }
>   
>   /*