[PATCH v3 07/17] drm: Add logging function for DP VSC SDP

[Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>]

When receiving video it is very useful to be able to log DP VSC SDP.
This greatly simplifies debugging.

v2: Minor style fix
v3: Move logging functions to drm core [Jani N]

Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 174 ++++++++++++++++++++++++++++++++
 include/drm/drm_dp_helper.h     |   3 +
 2 files changed, 177 insertions(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 5a103e9b3c86..5e3aef8c32e0 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1395,3 +1395,177 @@ int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_S
 	return num_bpc;
 }
 EXPORT_SYMBOL(drm_dp_dsc_sink_supported_input_bpcs);
+
+static const char *dp_colorspace_get_name(enum dp_colorspace colorspace)
+{
+	if (colorspace < 0 || colorspace > DP_COLORSPACE_RESERVED)
+		return "Invalid";
+
+	switch (colorspace) {
+	case DP_COLORSPACE_RGB:
+		return "RGB";
+	case DP_COLORSPACE_YUV444:
+		return "YUV444";
+	case DP_COLORSPACE_YUV422:
+		return "YUV422";
+	case DP_COLORSPACE_YUV420:
+		return "YUV420";
+	case DP_COLORSPACE_Y_ONLY:
+		return "Y_ONLY";
+	case DP_COLORSPACE_RAW:
+		return "RAW";
+	default:
+		return "Reserved";
+	}
+}
+
+static const char *dp_colorimetry_get_name(enum dp_colorspace colorspace,
+					   enum dp_colorimetry colorimetry)
+{
+	if (colorspace < 0 || colorspace > DP_COLORSPACE_RESERVED)
+		return "Invalid";
+
+	switch (colorimetry) {
+	case DP_COLORIMETRY_DEFAULT:
+		switch (colorspace) {
+		case DP_COLORSPACE_RGB:
+			return "sRGB";
+		case DP_COLORSPACE_YUV444:
+		case DP_COLORSPACE_YUV422:
+		case DP_COLORSPACE_YUV420:
+			return "BT.601";
+		case DP_COLORSPACE_Y_ONLY:
+			return "DICOM PS3.14";
+		case DP_COLORSPACE_RAW:
+			return "Custom Color Profile";
+		default:
+			return "Reserved";
+		}
+	case DP_COLORIMETRY_RGB_WIDE_FIXED: /* and DP_COLORIMETRY_BT709_YCC */
+		switch (colorspace) {
+		case DP_COLORSPACE_RGB:
+			return "Wide Fixed";
+		case DP_COLORSPACE_YUV444:
+		case DP_COLORSPACE_YUV422:
+		case DP_COLORSPACE_YUV420:
+			return "BT.709";
+		default:
+			return "Reserved";
+		}
+	case DP_COLORIMETRY_RGB_WIDE_FLOAT: /* and DP_COLORIMETRY_XVYCC_601 */
+		switch (colorspace) {
+		case DP_COLORSPACE_RGB:
+			return "Wide Float";
+		case DP_COLORSPACE_YUV444:
+		case DP_COLORSPACE_YUV422:
+		case DP_COLORSPACE_YUV420:
+			return "xvYCC 601";
+		default:
+			return "Reserved";
+		}
+	case DP_COLORIMETRY_OPRGB: /* and DP_COLORIMETRY_XVYCC_709 */
+		switch (colorspace) {
+		case DP_COLORSPACE_RGB:
+			return "OpRGB";
+		case DP_COLORSPACE_YUV444:
+		case DP_COLORSPACE_YUV422:
+		case DP_COLORSPACE_YUV420:
+			return "xvYCC 709";
+		default:
+			return "Reserved";
+		}
+	case DP_COLORIMETRY_DCI_P3_RGB: /* and DP_COLORIMETRY_SYCC_601 */
+		switch (colorspace) {
+		case DP_COLORSPACE_RGB:
+			return "DCI-P3";
+		case DP_COLORSPACE_YUV444:
+		case DP_COLORSPACE_YUV422:
+		case DP_COLORSPACE_YUV420:
+			return "sYCC 601";
+		default:
+			return "Reserved";
+		}
+	case DP_COLORIMETRY_RGB_CUSTOM: /* and DP_COLORIMETRY_OPYCC_601 */
+		switch (colorspace) {
+		case DP_COLORSPACE_RGB:
+			return "Custom Profile";
+		case DP_COLORSPACE_YUV444:
+		case DP_COLORSPACE_YUV422:
+		case DP_COLORSPACE_YUV420:
+			return "OpYCC 601";
+		default:
+			return "Reserved";
+		}
+	case DP_COLORIMETRY_BT2020_RGB: /* and DP_COLORIMETRY_BT2020_CYCC */
+		switch (colorspace) {
+		case DP_COLORSPACE_RGB:
+			return "BT.2020 RGB";
+		case DP_COLORSPACE_YUV444:
+		case DP_COLORSPACE_YUV422:
+		case DP_COLORSPACE_YUV420:
+			return "BT.2020 CYCC";
+		default:
+			return "Reserved";
+		}
+	case DP_COLORIMETRY_BT2020_YCC:
+		switch (colorspace) {
+		case DP_COLORSPACE_YUV444:
+		case DP_COLORSPACE_YUV422:
+		case DP_COLORSPACE_YUV420:
+			return "BT.2020 YCC";
+		default:
+			return "Reserved";
+		}
+	default:
+		return "Invalid";
+	}
+}
+
+static const char *dp_dynamic_range_get_name(enum dp_dynamic_range dynamic_range)
+{
+	switch (dynamic_range) {
+	case DP_DYNAMIC_RANGE_VESA:
+		return "VESA range";
+	case DP_DYNAMIC_RANGE_CTA:
+		return "CTA range";
+	default:
+		return "Invalid";
+	}
+}
+
+static const char *dp_content_type_get_name(enum dp_content_type content_type)
+{
+	switch (content_type) {
+	case DP_CONTENT_TYPE_NOT_DEFINED:
+		return "Not defined";
+	case DP_CONTENT_TYPE_GRAPHICS:
+		return "Graphics";
+	case DP_CONTENT_TYPE_PHOTO:
+		return "Photo";
+	case DP_CONTENT_TYPE_VIDEO:
+		return "Video";
+	case DP_CONTENT_TYPE_GAME:
+		return "Game";
+	default:
+		return "Reserved";
+	}
+}
+
+void drm_dp_vsc_sdp_log(const char *level, struct device *dev,
+			const struct drm_dp_vsc_sdp *vsc)
+{
+#define DP_SDP_LOG(fmt, ...) dev_printk(level, dev, fmt, ##__VA_ARGS__)
+	DP_SDP_LOG("DP SDP: %s, revision %u, length %u\n", "VSC",
+		   vsc->revision, vsc->length);
+	DP_SDP_LOG("    colorspace: %s\n",
+		   dp_colorspace_get_name(vsc->colorspace));
+	DP_SDP_LOG("    colorimetry: %s\n",
+		   dp_colorimetry_get_name(vsc->colorspace, vsc->colorimetry));
+	DP_SDP_LOG("    bpc: %u\n", vsc->bpc);
+	DP_SDP_LOG("    dynamic range: %s\n",
+		   dp_dynamic_range_get_name(vsc->dynamic_range));
+	DP_SDP_LOG("    content type: %s\n",
+		   dp_content_type_get_name(vsc->content_type));
+#undef DP_SDP_LOG
+}
+EXPORT_SYMBOL(drm_dp_vsc_sdp_log);
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index c098727681fa..00b775df6241 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1266,6 +1266,9 @@ struct drm_dp_vsc_sdp {
 	enum dp_content_type content_type;
 };
 
+void drm_dp_vsc_sdp_log(const char *level, struct device *dev,
+			const struct drm_dp_vsc_sdp *vsc);
+
 int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE]);
 
 static inline int
-- 
2.24.1