Re: [PATCH 02/15] drm/amdgpu: use drm_* functions instead of duplicated code in amdgpu driver

[Harry Wentland <harry.wentland@amd.com>]

On 2021-10-15 07:37, Claudio Suarez wrote:
> a) Once EDID is parsed, the monitor HDMI support information is available
> through drm_display_info.is_hdmi. The amdgpu driver still calls
> drm_detect_hdmi_monitor() to retrieve the same information, which
> is less efficient. Change to drm_display_info.is_hdmi
> 
> This is a TODO task in Documentation/gpu/todo.rst
> 
> b) drm_display_info is updated by drm_get_edid() or
> drm_connector_update_edid_property(). In the amdgpu driver it is almost
> always updated when the edid is read in amdgpu_connector_get_edid(),
> but not always.  Change amdgpu_connector_get_edid() and
> amdgpu_connector_free_edid() to keep drm_display_info updated. This allows a)
> to work properly.
> 
> c) Use drm_edid_get_monitor_name() instead of duplicating the code that
> parses the EDID in dm_helpers_parse_edid_caps()
> 
> Also, remove the unused "struct dc_context *ctx" parameter in
> dm_helpers_parse_edid_caps()
> 

Thanks for this work.

The fact that you listed three separate changes in this commit
is a clear indication that this patch should be three separate
patches instead. Separating the functional bits from the straight
refactor will help with bisection if this leads to a regression.

All changes look reasonable to me, though. With this patch split
into three patches in the sequence (b), (c), then (a) this is
Reviewed-by: Harry Wentland <harry.wentland@amd.com>

Harry

> Signed-off-by: Claudio Suarez <cssk@net-c.es>
> ---
>  .../gpu/drm/amd/amdgpu/amdgpu_connectors.c    | 23 +++++++----
>  .../gpu/drm/amd/amdgpu/amdgpu_connectors.h    |  2 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_display.c   |  2 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c  |  4 +-
>  .../gpu/drm/amd/amdgpu/atombios_encoders.c    |  6 +--
>  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |  3 +-
>  .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 39 ++++++-------------
>  drivers/gpu/drm/amd/display/dc/core/dc.c      |  2 +-
>  drivers/gpu/drm/amd/display/dc/dm_helpers.h   |  2 +-
>  9 files changed, 39 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
> index b9c11c2b2885..7b41a1120b70 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
> @@ -25,6 +25,7 @@
>   */
>  
>  #include <drm/drm_edid.h>
> +#include <drm/drm_connector.h>
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_dp_helper.h>
>  #include <drm/drm_probe_helper.h>
> @@ -108,7 +109,7 @@ int amdgpu_connector_get_monitor_bpc(struct drm_connector *connector)
>  	case DRM_MODE_CONNECTOR_DVII:
>  	case DRM_MODE_CONNECTOR_HDMIB:
>  		if (amdgpu_connector->use_digital) {
> -			if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector))) {
> +			if (amdgpu_connector_is_hdmi_monitor(connector)) {
>  				if (connector->display_info.bpc)
>  					bpc = connector->display_info.bpc;
>  			}
> @@ -116,7 +117,7 @@ int amdgpu_connector_get_monitor_bpc(struct drm_connector *connector)
>  		break;
>  	case DRM_MODE_CONNECTOR_DVID:
>  	case DRM_MODE_CONNECTOR_HDMIA:
> -		if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector))) {
> +		if (amdgpu_connector_is_hdmi_monitor(connector)) {
>  			if (connector->display_info.bpc)
>  				bpc = connector->display_info.bpc;
>  		}
> @@ -125,7 +126,7 @@ int amdgpu_connector_get_monitor_bpc(struct drm_connector *connector)
>  		dig_connector = amdgpu_connector->con_priv;
>  		if ((dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
>  		    (dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP) ||
> -		    drm_detect_hdmi_monitor(amdgpu_connector_edid(connector))) {
> +		    (amdgpu_connector_is_hdmi_monitor(connector))) {
>  			if (connector->display_info.bpc)
>  				bpc = connector->display_info.bpc;
>  		}
> @@ -149,7 +150,7 @@ int amdgpu_connector_get_monitor_bpc(struct drm_connector *connector)
>  		break;
>  	}
>  
> -	if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector))) {
> +	if (amdgpu_connector_is_hdmi_monitor(connector)) {
>  		/*
>  		 * Pre DCE-8 hw can't handle > 12 bpc, and more than 12 bpc doesn't make
>  		 * much sense without support for > 12 bpc framebuffers. RGB 4:4:4 at
> @@ -315,8 +316,10 @@ static void amdgpu_connector_get_edid(struct drm_connector *connector)
>  	if (!amdgpu_connector->edid) {
>  		/* some laptops provide a hardcoded edid in rom for LCDs */
>  		if (((connector->connector_type == DRM_MODE_CONNECTOR_LVDS) ||
> -		     (connector->connector_type == DRM_MODE_CONNECTOR_eDP)))
> +		     (connector->connector_type == DRM_MODE_CONNECTOR_eDP))) {
>  			amdgpu_connector->edid = amdgpu_connector_get_hardcoded_edid(adev);
> +			drm_connector_update_edid_property(connector, amdgpu_connector->edid);
> +		}
>  	}
>  }
>  
> @@ -326,6 +329,7 @@ static void amdgpu_connector_free_edid(struct drm_connector *connector)
>  
>  	kfree(amdgpu_connector->edid);
>  	amdgpu_connector->edid = NULL;
> +	drm_connector_update_edid_property(connector, NULL);
>  }
>  
>  static int amdgpu_connector_ddc_get_modes(struct drm_connector *connector)
> @@ -1170,7 +1174,7 @@ static enum drm_mode_status amdgpu_connector_dvi_mode_valid(struct drm_connector
>  		    (amdgpu_connector->connector_object_id == CONNECTOR_OBJECT_ID_DUAL_LINK_DVI_D) ||
>  		    (amdgpu_connector->connector_object_id == CONNECTOR_OBJECT_ID_HDMI_TYPE_B)) {
>  			return MODE_OK;
> -		} else if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector))) {
> +		} else if (amdgpu_connector_is_hdmi_monitor(connector)) {
>  			/* HDMI 1.3+ supports max clock of 340 Mhz */
>  			if (mode->clock > 340000)
>  				return MODE_CLOCK_HIGH;
> @@ -1322,6 +1326,11 @@ bool amdgpu_connector_is_dp12_capable(struct drm_connector *connector)
>  	return false;
>  }
>  
> +bool amdgpu_connector_is_hdmi_monitor(struct drm_connector *connector)
> +{
> +	return connector->display_info.is_hdmi;
> +}
> +
>  static enum drm_connector_status
>  amdgpu_connector_dp_detect(struct drm_connector *connector, bool force)
>  {
> @@ -1462,7 +1471,7 @@ static enum drm_mode_status amdgpu_connector_dp_mode_valid(struct drm_connector
>  		    (amdgpu_dig_connector->dp_sink_type == CONNECTOR_OBJECT_ID_eDP)) {
>  			return amdgpu_atombios_dp_mode_valid_helper(connector, mode);
>  		} else {
> -			if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector))) {
> +			if (amdgpu_connector_is_hdmi_monitor(connector)) {
>  				/* HDMI 1.3+ supports max clock of 340 Mhz */
>  				if (mode->clock > 340000)
>  					return MODE_CLOCK_HIGH;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.h
> index 61fcef15ad72..0843540e01f2 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.h
> @@ -29,6 +29,8 @@ void amdgpu_connector_hotplug(struct drm_connector *connector);
>  int amdgpu_connector_get_monitor_bpc(struct drm_connector *connector);
>  u16 amdgpu_connector_encoder_get_dp_bridge_encoder_id(struct drm_connector *connector);
>  bool amdgpu_connector_is_dp12_capable(struct drm_connector *connector);
> +bool amdgpu_connector_is_hdmi_monitor(struct drm_connector *connector);
> +
>  void
>  amdgpu_connector_add(struct amdgpu_device *adev,
>  		      uint32_t connector_id,
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> index dc50c05f23fc..41b43207e9fa 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> @@ -1364,7 +1364,7 @@ bool amdgpu_display_crtc_scaling_mode_fixup(struct drm_crtc *crtc,
>  		if ((!(mode->flags & DRM_MODE_FLAG_INTERLACE)) &&
>  		    ((amdgpu_encoder->underscan_type == UNDERSCAN_ON) ||
>  		     ((amdgpu_encoder->underscan_type == UNDERSCAN_AUTO) &&
> -		      drm_detect_hdmi_monitor(amdgpu_connector_edid(connector)) &&
> +		      amdgpu_connector_is_hdmi_monitor(connector) &&
>  		      amdgpu_display_is_hdtv_mode(mode)))) {
>  			if (amdgpu_encoder->underscan_hborder != 0)
>  				amdgpu_crtc->h_border = amdgpu_encoder->underscan_hborder;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c
> index af4ef84e27a7..34799786bb40 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_encoders.c
> @@ -222,7 +222,7 @@ bool amdgpu_dig_monitor_is_duallink(struct drm_encoder *encoder,
>  	case DRM_MODE_CONNECTOR_HDMIB:
>  		if (amdgpu_connector->use_digital) {
>  			/* HDMI 1.3 supports up to 340 Mhz over single link */
> -			if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector))) {
> +			if (amdgpu_connector_is_hdmi_monitor(connector)) {
>  				if (pixel_clock > 340000)
>  					return true;
>  				else
> @@ -244,7 +244,7 @@ bool amdgpu_dig_monitor_is_duallink(struct drm_encoder *encoder,
>  			return false;
>  		else {
>  			/* HDMI 1.3 supports up to 340 Mhz over single link */
> -			if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector))) {
> +			if (amdgpu_connector_is_hdmi_monitor(connector)) {
>  				if (pixel_clock > 340000)
>  					return true;
>  				else
> diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
> index 6134ed964027..07c4ff14f2a7 100644
> --- a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
> +++ b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
> @@ -469,7 +469,7 @@ int amdgpu_atombios_encoder_get_encoder_mode(struct drm_encoder *encoder)
>  			if (amdgpu_connector->use_digital &&
>  			    (amdgpu_connector->audio == AMDGPU_AUDIO_ENABLE))
>  				return ATOM_ENCODER_MODE_HDMI;
> -			else if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector)) &&
> +			else if (amdgpu_connector_is_hdmi_monitor(connector) &&
>  				 (amdgpu_connector->audio == AMDGPU_AUDIO_AUTO))
>  				return ATOM_ENCODER_MODE_HDMI;
>  			else if (amdgpu_connector->use_digital)
> @@ -488,7 +488,7 @@ int amdgpu_atombios_encoder_get_encoder_mode(struct drm_encoder *encoder)
>  		if (amdgpu_audio != 0) {
>  			if (amdgpu_connector->audio == AMDGPU_AUDIO_ENABLE)
>  				return ATOM_ENCODER_MODE_HDMI;
> -			else if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector)) &&
> +			else if (amdgpu_connector_is_hdmi_monitor(connector) &&
>  				 (amdgpu_connector->audio == AMDGPU_AUDIO_AUTO))
>  				return ATOM_ENCODER_MODE_HDMI;
>  			else
> @@ -506,7 +506,7 @@ int amdgpu_atombios_encoder_get_encoder_mode(struct drm_encoder *encoder)
>  		} else if (amdgpu_audio != 0) {
>  			if (amdgpu_connector->audio == AMDGPU_AUDIO_ENABLE)
>  				return ATOM_ENCODER_MODE_HDMI;
> -			else if (drm_detect_hdmi_monitor(amdgpu_connector_edid(connector)) &&
> +			else if (amdgpu_connector_is_hdmi_monitor(connector) &&
>  				 (amdgpu_connector->audio == AMDGPU_AUDIO_AUTO))
>  				return ATOM_ENCODER_MODE_HDMI;
>  			else
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 1ea31dcc7a8b..02ecd216a556 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -2583,13 +2583,12 @@ void amdgpu_dm_update_connector_after_detect(
>  			aconnector->edid =
>  				(struct edid *)sink->dc_edid.raw_edid;
>  
> -			drm_connector_update_edid_property(connector,
> -							   aconnector->edid);
>  			if (aconnector->dc_link->aux_mode)
>  				drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
>  						    aconnector->edid);
>  		}
>  
> +		drm_connector_update_edid_property(connector, aconnector->edid);
>  		amdgpu_dm_update_freesync_caps(connector, aconnector->edid);
>  		update_connector_ext_caps(aconnector);
>  	} else {
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> index 6fee12c91ef5..2051dd27ef3b 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> @@ -29,6 +29,7 @@
>  
>  #include <drm/drm_probe_helper.h>
>  #include <drm/amdgpu_drm.h>
> +#include <drm/drm_connector.h>
>  #include <drm/drm_edid.h>
>  
>  #include "dm_services.h"
> @@ -37,6 +38,7 @@
>  #include "amdgpu_dm.h"
>  #include "amdgpu_dm_irq.h"
>  #include "amdgpu_dm_mst_types.h"
> +#include "amdgpu_connectors.h"
>  
>  #include "dm_helpers.h"
>  
> @@ -50,16 +52,17 @@
>   *	void
>   * */
>  enum dc_edid_status dm_helpers_parse_edid_caps(
> -		struct dc_context *ctx,
> +		struct dc_link *link,
>  		const struct dc_edid *edid,
>  		struct dc_edid_caps *edid_caps)
>  {
> +	struct amdgpu_dm_connector *aconnector = link->priv;
> +	struct drm_connector *connector = &aconnector->base;
>  	struct edid *edid_buf = (struct edid *) edid->raw_edid;
>  	struct cea_sad *sads;
>  	int sad_count = -1;
>  	int sadb_count = -1;
>  	int i = 0;
> -	int j = 0;
>  	uint8_t *sadb = NULL;
>  
>  	enum dc_edid_status result = EDID_OK;
> @@ -78,23 +81,11 @@ enum dc_edid_status dm_helpers_parse_edid_caps(
>  	edid_caps->manufacture_week = edid_buf->mfg_week;
>  	edid_caps->manufacture_year = edid_buf->mfg_year;
>  
> -	/* One of the four detailed_timings stores the monitor name. It's
> -	 * stored in an array of length 13. */
> -	for (i = 0; i < 4; i++) {
> -		if (edid_buf->detailed_timings[i].data.other_data.type == 0xfc) {
> -			while (j < 13 && edid_buf->detailed_timings[i].data.other_data.data.str.str[j]) {
> -				if (edid_buf->detailed_timings[i].data.other_data.data.str.str[j] == '\n')
> -					break;
> -
> -				edid_caps->display_name[j] =
> -					edid_buf->detailed_timings[i].data.other_data.data.str.str[j];
> -				j++;
> -			}
> -		}
> -	}
> +	drm_edid_get_monitor_name(edid_buf,
> +				  edid_caps->display_name,
> +				  AUDIO_INFO_DISPLAY_NAME_SIZE_IN_CHARS);
>  
> -	edid_caps->edid_hdmi = drm_detect_hdmi_monitor(
> -			(struct edid *) edid->raw_edid);
> +	edid_caps->edid_hdmi = amdgpu_connector_is_hdmi_monitor(connector);
>  
>  	sad_count = drm_edid_to_sad((struct edid *) edid->raw_edid, &sads);
>  	if (sad_count <= 0)
> @@ -610,14 +601,8 @@ enum dc_edid_status dm_helpers_read_local_edid(
>  		/* We don't need the original edid anymore */
>  		kfree(edid);
>  
> -		/* connector->display_info will be parsed from EDID and saved
> -		 * into drm_connector->display_info from edid by call stack
> -		 * below:
> -		 * drm_parse_ycbcr420_deep_color_info
> -		 * drm_parse_hdmi_forum_vsdb
> -		 * drm_parse_cea_ext
> -		 * drm_add_display_info
> -		 * drm_connector_update_edid_property
> +		/* connector->display_info is parsed from EDID and saved
> +		 * into drm_connector->display_info
>  		 *
>  		 * drm_connector->display_info will be used by amdgpu_dm funcs,
>  		 * like fill_stream_properties_from_drm_display_mode
> @@ -625,7 +610,7 @@ enum dc_edid_status dm_helpers_read_local_edid(
>  		amdgpu_dm_update_connector_after_detect(aconnector);
>  
>  		edid_status = dm_helpers_parse_edid_caps(
> -						ctx,
> +						link,
>  						&sink->dc_edid,
>  						&sink->edid_caps);
>  
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
> index c798c65d4276..5efe89fe6c2c 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
> @@ -3254,7 +3254,7 @@ struct dc_sink *dc_link_add_remote_sink(
>  		goto fail_add_sink;
>  
>  	edid_status = dm_helpers_parse_edid_caps(
> -			link->ctx,
> +			link,
>  			&dc_sink->dc_edid,
>  			&dc_sink->edid_caps);
>  
> diff --git a/drivers/gpu/drm/amd/display/dc/dm_helpers.h b/drivers/gpu/drm/amd/display/dc/dm_helpers.h
> index 9ab854293ace..94dc80060610 100644
> --- a/drivers/gpu/drm/amd/display/dc/dm_helpers.h
> +++ b/drivers/gpu/drm/amd/display/dc/dm_helpers.h
> @@ -59,7 +59,7 @@ void dm_helpers_free_gpu_mem(
>  		void *pvMem);
>  
>  enum dc_edid_status dm_helpers_parse_edid_caps(
> -	struct dc_context *ctx,
> +	struct dc_link *link,
>  	const struct dc_edid *edid,
>  	struct dc_edid_caps *edid_caps);
>  
>