Re: [PATCH 4/4] drm/edid: Avoid multiple log lines for HFVSDB parsing

[Jani Nikula <jani.nikula@linux.intel.com>]

On Thu, 11 Aug 2022, Ankit Nautiyal <ankit.k.nautiyal@intel.com> wrote:
> Replace multiple log lines with a single log line at the end of
> parsing HF-VSDB. Also use drm_dbg_kms instead of DRM_DBG_KMS, and
> add log for DSC1.2 support.
>
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
> ---
>  drivers/gpu/drm/drm_edid.c | 21 +++++++++++++--------
>  1 file changed, 13 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index c9c3a9c8fa26..7a319d570297 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -5781,6 +5781,9 @@ static void drm_parse_hdmi_forum_scds(struct drm_connector *connector,
>  	struct drm_display_info *display = &connector->display_info;
>  	struct drm_hdmi_info *hdmi = &display->hdmi;
>  	struct drm_hdmi_dsc_cap *hdmi_dsc = &hdmi->dsc_cap;
> +	u32 max_tmds_clock = 0;

This should be int because display->max_tmds_clock is int. Yes, it's a
change from the current local var, but logging u32 would require %u
instead of %d in the format string anyway, so better just use the right
type.

> +	u8 max_frl_rate = 0;
> +	bool dsc_support = false;
>  
>  	display->has_hdmi_infoframe = true;
>  
> @@ -5800,14 +5803,13 @@ static void drm_parse_hdmi_forum_scds(struct drm_connector *connector,
>  	 */
>  
>  	if (hf_scds[5]) {
> -		/* max clock is 5000 KHz times block value */
> -		u32 max_tmds_clock = hf_scds[5] * 5000;
>  		struct drm_scdc *scdc = &hdmi->scdc;
>  
> +		/* max clock is 5000 KHz times block value */
> +		max_tmds_clock = hf_scds[5] * 5000;
> +
>  		if (max_tmds_clock > 340000) {
>  			display->max_tmds_clock = max_tmds_clock;
> -			DRM_DEBUG_KMS("HF-VSDB: max TMDS clock %d kHz\n",
> -				display->max_tmds_clock);

Hmm, the logic for what is logged gets changed.

>  		}
>  
>  		if (scdc->supported) {
> @@ -5820,9 +5822,6 @@ static void drm_parse_hdmi_forum_scds(struct drm_connector *connector,
>  	}
>  
>  	if (hf_scds[7]) {
> -		u8 max_frl_rate;
> -
> -		DRM_DEBUG_KMS("hdmi_21 sink detected. parsing edid\n");
>  		max_frl_rate = (hf_scds[7] & DRM_EDID_MAX_FRL_RATE_MASK) >> 4;
>  		drm_get_max_frl_rate(max_frl_rate, &hdmi->max_lanes,
>  				     &hdmi->max_frl_rate_per_lane);
> @@ -5830,8 +5829,14 @@ static void drm_parse_hdmi_forum_scds(struct drm_connector *connector,
>  
>  	drm_parse_ycbcr420_deep_color_info(connector, hf_scds);
>  
> -	if (cea_db_payload_len(hf_scds) >= 11 && hf_scds[11])
> +	if (cea_db_payload_len(hf_scds) >= 11 && hf_scds[11]) {
>  		drm_parse_dsc_info(hdmi_dsc, hf_scds);
> +		dsc_support = true;
> +	}
> +
> +	drm_dbg_kms(connector->dev,
> +		    "HF-VSDB: max TMDS clock:%d Khz, HDMI2.1 support:%s, DSC1.2 support:%s\n",

Nitpicks, %d needs int instead of u32, "kHz" not "Khz", "HDMI 2.1" and
"DSC 1.2" with spaces, would prefer a space after ":".

> +		    max_tmds_clock, max_frl_rate ? "yes" : "no", dsc_support ? "yes" : "no");

See str_yes_no().

BR,
Jani.

>  }
>  
>  static void drm_parse_hdmi_deep_color_info(struct drm_connector *connector,

-- 
Jani Nikula, Intel Open Source Graphics Center