drm/amd/display: HDMI 2.x audio bandwidth check

Add HDMI 2.x audio bandwidth check
Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Chris Park <Chris.Park@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

@@ -2811,3 +2811,51 @@ unsigned int resource_pixel_format_to_bpp(enum surface_pixel_format format)
 		return -1;
 	}
 }
+static unsigned int get_max_audio_sample_rate(struct audio_mode *modes)
+{
+	if (modes) {
+		if (modes->sample_rates.rate.RATE_192)
+			return 192000;
+		if (modes->sample_rates.rate.RATE_176_4)
+			return 176400;
+		if (modes->sample_rates.rate.RATE_96)
+			return 96000;
+		if (modes->sample_rates.rate.RATE_88_2)
+			return 88200;
+		if (modes->sample_rates.rate.RATE_48)
+			return 48000;
+		if (modes->sample_rates.rate.RATE_44_1)
+			return 44100;
+		if (modes->sample_rates.rate.RATE_32)
+			return 32000;
+	}
+	/*original logic when no audio info*/
+	return 441000;
+}
+
+void get_audio_check(struct audio_info *aud_modes,
+	struct audio_check *audio_chk)
+{
+	unsigned int i;
+	unsigned int max_sample_rate = 0;
+
+	if (aud_modes) {
+		audio_chk->audio_packet_type = 0x2;/*audio sample packet AP = .25 for layout0, 1 for layout1*/
+
+		audio_chk->max_audiosample_rate = 0;
+		for (i = 0; i < aud_modes->mode_count; i++) {
+			max_sample_rate = get_max_audio_sample_rate(&aud_modes->modes[i]);
+			if (audio_chk->max_audiosample_rate < max_sample_rate)
+				audio_chk->max_audiosample_rate = max_sample_rate;
+			/*dts takes the same as type 2: AP = 0.25*/
+		}
+		/*check which one take more bandwidth*/
+		if (audio_chk->max_audiosample_rate > 192000)
+			audio_chk->audio_packet_type = 0x9;/*AP =1*/
+		audio_chk->acat = 0;/*not support*/
+	}
+}
+
+
+
+

drivers/gpu/drm/amd/display/dc/dc_types.h

@@ -598,7 +598,11 @@ struct audio_info {
 	/* this field must be last in this struct */
 	struct audio_mode modes[DC_MAX_AUDIO_DESC_COUNT];
 };
-
+struct audio_check {
+	unsigned int audio_packet_type;
+	unsigned int max_audiosample_rate;
+	unsigned int acat;
+};
 enum dc_infoframe_type {
 	DC_HDMI_INFOFRAME_TYPE_VENDOR = 0x81,
 	DC_HDMI_INFOFRAME_TYPE_AVI = 0x82,

drivers/gpu/drm/amd/display/dc/dml/display_mode_structs.h

@@ -278,6 +278,7 @@ struct _vcs_dpi_display_output_params_st {
 	int output_type;
 	int output_format;
 	int dsc_slices;
+	int max_audio_sample_rate;
 	struct writeback_st wb;
 };
 

drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c

@@ -454,7 +454,7 @@ static void fetch_pipe_params(struct display_mode_lib *mode_lib)
 				dout->dp_lanes;
 		/* TODO: Needs to be set based on dout->audio.audio_sample_rate_khz/sample_layout */
 		mode_lib->vba.AudioSampleRate[mode_lib->vba.NumberOfActivePlanes] =
-			44.1 * 1000;
+			dout->max_audio_sample_rate;
 		mode_lib->vba.AudioSampleLayout[mode_lib->vba.NumberOfActivePlanes] =
 			1;
 		mode_lib->vba.DRAMClockChangeLatencyOverride = 0.0;

drivers/gpu/drm/amd/display/dc/inc/resource.h

@@ -177,4 +177,6 @@ void update_audio_usage(
 
 unsigned int resource_pixel_format_to_bpp(enum surface_pixel_format format);
 
+void get_audio_check(struct audio_info *aud_modes,
+	struct audio_check *aud_chk);
 #endif /* DRIVERS_GPU_DRM_AMD_DC_DEV_DC_INC_RESOURCE_H_ */