drm/msm/dp: Use function arguments for audio operations

The dp_audio read and write operations uses members in struct dp_catalog
for passing arguments and return values. This adds unnecessary
complexity to the implementation, as it turns out after detangling the
logic that no state is actually held in these variables.

Clean this up by using function arguments and return values for passing
the data.
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/585350/
Link: https://lore.kernel.org/r/20240328-msm-dp-cleanup-v2-6-a5aed9798d32@quicinc.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/dp/dp_audio.c

@@ -32,11 +32,7 @@ static u32 dp_audio_get_header(struct dp_catalog *catalog,
 		enum dp_catalog_audio_sdp_type sdp,
 		enum dp_catalog_audio_header_type header)
 {
-	catalog->sdp_type = sdp;
-	catalog->sdp_header = header;
-	dp_catalog_audio_get_header(catalog);
-
-	return catalog->audio_data;
+	return dp_catalog_audio_get_header(catalog, sdp, header);
 }
 
 static void dp_audio_set_header(struct dp_catalog *catalog,
@@ -44,10 +40,7 @@ static void dp_audio_set_header(struct dp_catalog *catalog,
 		enum dp_catalog_audio_sdp_type sdp,
 		enum dp_catalog_audio_header_type header)
 {
-	catalog->sdp_type = sdp;
-	catalog->sdp_header = header;
-	catalog->audio_data = data;
-	dp_catalog_audio_set_header(catalog);
+	dp_catalog_audio_set_header(catalog, sdp, header, data);
 }
 
 static void dp_audio_stream_sdp(struct dp_audio_private *audio)
@@ -317,8 +310,7 @@ static void dp_audio_setup_acr(struct dp_audio_private *audio)
 		break;
 	}
 
-	catalog->audio_data = select;
-	dp_catalog_audio_config_acr(catalog);
+	dp_catalog_audio_config_acr(catalog, select);
 }
 
 static void dp_audio_safe_to_exit_level(struct dp_audio_private *audio)
@@ -344,16 +336,14 @@ static void dp_audio_safe_to_exit_level(struct dp_audio_private *audio)
 		break;
 	}
 
-	catalog->audio_data = safe_to_exit_level;
-	dp_catalog_audio_sfe_level(catalog);
+	dp_catalog_audio_sfe_level(catalog, safe_to_exit_level);
 }
 
 static void dp_audio_enable(struct dp_audio_private *audio, bool enable)
 {
 	struct dp_catalog *catalog = audio->catalog;
 
-	catalog->audio_data = enable;
-	dp_catalog_audio_enable(catalog);
+	dp_catalog_audio_enable(catalog, enable);
 }
 
 static struct dp_audio_private *dp_audio_get_data(struct platform_device *pdev)

drivers/gpu/drm/msm/dp/dp_catalog.c

@@ -1160,34 +1160,28 @@ struct dp_catalog *dp_catalog_get(struct device *dev)
 	return &catalog->dp_catalog;
 }
 
-void dp_catalog_audio_get_header(struct dp_catalog *dp_catalog)
+u32 dp_catalog_audio_get_header(struct dp_catalog *dp_catalog,
+				enum dp_catalog_audio_sdp_type sdp,
+				enum dp_catalog_audio_header_type header)
 {
 	struct dp_catalog_private *catalog;
 	u32 (*sdp_map)[DP_AUDIO_SDP_HEADER_MAX];
-	enum dp_catalog_audio_sdp_type sdp;
-	enum dp_catalog_audio_header_type header;
-
-	if (!dp_catalog)
-		return;
 
 	catalog = container_of(dp_catalog,
 		struct dp_catalog_private, dp_catalog);
 
 	sdp_map = catalog->audio_map;
-	sdp     = dp_catalog->sdp_type;
-	header  = dp_catalog->sdp_header;
 
-	dp_catalog->audio_data = dp_read_link(catalog,
-			sdp_map[sdp][header]);
+	return dp_read_link(catalog, sdp_map[sdp][header]);
 }
 
-void dp_catalog_audio_set_header(struct dp_catalog *dp_catalog)
+void dp_catalog_audio_set_header(struct dp_catalog *dp_catalog,
+				 enum dp_catalog_audio_sdp_type sdp,
+				 enum dp_catalog_audio_header_type header,
+				 u32 data)
 {
 	struct dp_catalog_private *catalog;
 	u32 (*sdp_map)[DP_AUDIO_SDP_HEADER_MAX];
-	enum dp_catalog_audio_sdp_type sdp;
-	enum dp_catalog_audio_header_type header;
-	u32 data;
 
 	if (!dp_catalog)
 		return;
@@ -1196,17 +1190,14 @@ void dp_catalog_audio_set_header(struct dp_catalog *dp_catalog)
 		struct dp_catalog_private, dp_catalog);
 
 	sdp_map = catalog->audio_map;
-	sdp     = dp_catalog->sdp_type;
-	header  = dp_catalog->sdp_header;
-	data    = dp_catalog->audio_data;
 
 	dp_write_link(catalog, sdp_map[sdp][header], data);
 }
 
-void dp_catalog_audio_config_acr(struct dp_catalog *dp_catalog)
+void dp_catalog_audio_config_acr(struct dp_catalog *dp_catalog, u32 select)
 {
 	struct dp_catalog_private *catalog;
-	u32 acr_ctrl, select;
+	u32 acr_ctrl;
 
 	if (!dp_catalog)
 		return;
@@ -1214,7 +1205,6 @@ void dp_catalog_audio_config_acr(struct dp_catalog *dp_catalog)
 	catalog = container_of(dp_catalog,
 		struct dp_catalog_private, dp_catalog);
 
-	select = dp_catalog->audio_data;
 	acr_ctrl = select << 4 | BIT(31) | BIT(8) | BIT(14);
 
 	drm_dbg_dp(catalog->drm_dev, "select: %#x, acr_ctrl: %#x\n",
@@ -1223,10 +1213,9 @@ void dp_catalog_audio_config_acr(struct dp_catalog *dp_catalog)
 	dp_write_link(catalog, MMSS_DP_AUDIO_ACR_CTRL, acr_ctrl);
 }
 
-void dp_catalog_audio_enable(struct dp_catalog *dp_catalog)
+void dp_catalog_audio_enable(struct dp_catalog *dp_catalog, bool enable)
 {
 	struct dp_catalog_private *catalog;
-	bool enable;
 	u32 audio_ctrl;
 
 	if (!dp_catalog)
@@ -1235,7 +1224,6 @@ void dp_catalog_audio_enable(struct dp_catalog *dp_catalog)
 	catalog = container_of(dp_catalog,
 		struct dp_catalog_private, dp_catalog);
 
-	enable = !!dp_catalog->audio_data;
 	audio_ctrl = dp_read_link(catalog, MMSS_DP_AUDIO_CFG);
 
 	if (enable)
@@ -1330,10 +1318,10 @@ void dp_catalog_audio_init(struct dp_catalog *dp_catalog)
 	catalog->audio_map = sdp_map;
 }
 
-void dp_catalog_audio_sfe_level(struct dp_catalog *dp_catalog)
+void dp_catalog_audio_sfe_level(struct dp_catalog *dp_catalog, u32 safe_to_exit_level)
 {
 	struct dp_catalog_private *catalog;
-	u32 mainlink_levels, safe_to_exit_level;
+	u32 mainlink_levels;
 
 	if (!dp_catalog)
 		return;
@@ -1341,7 +1329,6 @@ void dp_catalog_audio_sfe_level(struct dp_catalog *dp_catalog)
 	catalog = container_of(dp_catalog,
 		struct dp_catalog_private, dp_catalog);
 
-	safe_to_exit_level = dp_catalog->audio_data;
 	mainlink_levels = dp_read_link(catalog, REG_DP_MAINLINK_LEVELS);
 	mainlink_levels &= 0xFE0;
 	mainlink_levels |= safe_to_exit_level;

drivers/gpu/drm/msm/dp/dp_catalog.h

@@ -48,9 +48,6 @@ enum dp_catalog_audio_header_type {
 };
 
 struct dp_catalog {
-	enum dp_catalog_audio_sdp_type sdp_type;
-	enum dp_catalog_audio_header_type sdp_header;
-	u32 audio_data;
 	bool wide_bus_en;
 };
 
@@ -115,12 +112,17 @@ void dp_catalog_panel_tpg_disable(struct dp_catalog *dp_catalog);
 struct dp_catalog *dp_catalog_get(struct device *dev);
 
 /* DP Audio APIs */
-void dp_catalog_audio_get_header(struct dp_catalog *catalog);
-void dp_catalog_audio_set_header(struct dp_catalog *catalog);
-void dp_catalog_audio_config_acr(struct dp_catalog *catalog);
-void dp_catalog_audio_enable(struct dp_catalog *catalog);
+u32 dp_catalog_audio_get_header(struct dp_catalog *dp_catalog,
+				enum dp_catalog_audio_sdp_type sdp,
+				enum dp_catalog_audio_header_type header);
+void dp_catalog_audio_set_header(struct dp_catalog *dp_catalog,
+				 enum dp_catalog_audio_sdp_type sdp,
+				 enum dp_catalog_audio_header_type header,
+				 u32 data);
+void dp_catalog_audio_config_acr(struct dp_catalog *catalog, u32 select);
+void dp_catalog_audio_enable(struct dp_catalog *catalog, bool enable);
 void dp_catalog_audio_config_sdp(struct dp_catalog *catalog);
 void dp_catalog_audio_init(struct dp_catalog *catalog);
-void dp_catalog_audio_sfe_level(struct dp_catalog *catalog);
+void dp_catalog_audio_sfe_level(struct dp_catalog *catalog, u32 safe_to_exit_level);
 
 #endif /* _DP_CATALOG_H_ */