drm/amd/display: Add basic kernel doc to CRC code under DC

Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -638,14 +638,17 @@ bool dc_stream_configure_crc(struct dc *dc, struct dc_stream_state *stream,
 
 /**
  * dc_stream_get_crc() - Get CRC values for the given stream.
- * @dc: DC object
+ *
+ * @dc: DC object.
  * @stream: The DC stream state of the stream to get CRCs from.
- * @r_cr: CRC value for the first of the 3 channels stored here.
- * @g_y:  CRC value for the second of the 3 channels stored here.
- * @b_cb: CRC value for the third of the 3 channels stored here.
+ * @r_cr: CRC value for the red component.
+ * @g_y:  CRC value for the green component.
+ * @b_cb: CRC value for the blue component.
  *
  * dc_stream_configure_crc needs to be called beforehand to enable CRCs.
- * Return false if stream is not found, or if CRCs are not enabled.
+ *
+ * Return:
+ * false if stream is not found, or if CRCs are not enabled.
  */
 bool dc_stream_get_crc(struct dc *dc, struct dc_stream_state *stream,
 		       uint32_t *r_cr, uint32_t *g_y, uint32_t *b_cb)

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c

@@ -1498,6 +1498,21 @@ bool optc1_configure_crc(struct timing_generator *optc,
 	return true;
 }
 
+/**
+ * optc1_get_crc - Capture CRC result per component
+ *
+ * @optc: timing_generator instance.
+ * @r_cr: 16-bit primary CRC signature for red data.
+ * @g_y: 16-bit primary CRC signature for green data.
+ * @b_cb: 16-bit primary CRC signature for blue data.
+ *
+ * This function reads the CRC signature from the OPTC registers. Notice that
+ * we have three registers to keep the CRC result per color component (RGB).
+ *
+ * Returns:
+ * If CRC is disabled, return false; otherwise, return true, and the CRC
+ * results in the parameters.
+ */
 bool optc1_get_crc(struct timing_generator *optc,
 		   uint32_t *r_cr, uint32_t *g_y, uint32_t *b_cb)
 {
@@ -1510,10 +1525,12 @@ bool optc1_get_crc(struct timing_generator *optc,
 	if (!field)
 		return false;
 
+	/* OTG_CRC0_DATA_RG has the CRC16 results for the red and green component */
 	REG_GET_2(OTG_CRC0_DATA_RG,
 		  CRC0_R_CR, r_cr,
 		  CRC0_G_Y, g_y);
 
+	/* OTG_CRC0_DATA_B has the CRC16 results for the blue component */
 	REG_GET(OTG_CRC0_DATA_B,
 		CRC0_B_CB, b_cb);
 

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

@@ -399,6 +399,10 @@ struct pipe_ctx {
 	struct dc_stream_state *stream;
 
 	struct plane_resource plane_res;
+
+	/**
+	 * @stream_res: Reference to DCN resource components such OPP and DSC.
+	 */
 	struct stream_resource stream_res;
 	struct link_resource link_res;
 

drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h

@@ -137,7 +137,13 @@ struct crc_params {
 	bool enable;
 };
 
+/**
+ * struct timing_generator - Entry point to Output Timing Generator feature.
+ */
 struct timing_generator {
+	/**
+	 * @funcs: Timing generator control functions
+	 */
 	const struct timing_generator_funcs *funcs;
 	struct dc_bios *bp;
 	struct dc_context *ctx;
@@ -148,7 +154,9 @@ struct dc_crtc_timing;
 
 struct drr_params;
 
-
+/**
+ * struct timing_generator_funcs - Control timing generator on a given device.
+ */
 struct timing_generator_funcs {
 	bool (*validate_timing)(struct timing_generator *tg,
 							const struct dc_crtc_timing *timing);
@@ -273,8 +281,8 @@ struct timing_generator_funcs {
 			       const struct crc_params *params);
 
 	/**
-	 * Get CRCs for the given timing generator. Return false if CRCs are
-	 * not enabled (via configure_crc).
+	 * @get_crc: Get CRCs for the given timing generator. Return false if
+	 * CRCs are not enabled (via configure_crc).
 	 */
 	bool (*get_crc)(struct timing_generator *tg,
 			uint32_t *r_cr, uint32_t *g_y, uint32_t *b_cb);