[PATCH] drm/i915/bios: add VBT DSI DSC debug logging

[Jani Nikula <jani.nikula@xxxxxxxxx>]

Improve the debug logging for DSC parameters for ports.

Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
 drivers/gpu/drm/i915/display/intel_bios.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
index e0e4e9b62d8d..51f9aca960f9 100644
--- a/drivers/gpu/drm/i915/display/intel_bios.c
+++ b/drivers/gpu/drm/i915/display/intel_bios.c
@@ -2157,19 +2157,22 @@ parse_compression_parameters(struct intel_display *display)
 
 	list_for_each_entry(devdata, &display->vbt.display_devices, node) {
 		const struct child_device_config *child = &devdata->child;
+		char port_name = port_name(intel_bios_encoder_port(devdata));
 
 		if (!child->compression_enable)
 			continue;
 
 		if (!params) {
 			drm_dbg_kms(display->drm,
-				    "VBT: compression params not available\n");
+				    "Port %c VBT indicates compression but params not available\n",
+				    port_name);
 			continue;
 		}
 
 		if (child->compression_method_cps) {
 			drm_dbg_kms(display->drm,
-				    "VBT: CPS compression not supported\n");
+				    "Port %c VBT indicates unsupported CPS compression\n",
+				    port_name);
 			continue;
 		}
 
@@ -2177,6 +2180,9 @@ parse_compression_parameters(struct intel_display *display)
 
 		devdata->dsc = kmemdup(&params->data[index],
 				       sizeof(*devdata->dsc), GFP_KERNEL);
+
+		drm_dbg_kms(display->drm, "Port %c VBT DSC index %d\n",
+			    port_name, index);
 	}
 }
 
@@ -3543,6 +3549,11 @@ bool intel_bios_get_dsc_params(struct intel_encoder *encoder,
 			if (!devdata->dsc)
 				return false;
 
+			drm_dbg_kms(display->drm,
+				    "[ENCODER:%d:%s] Found port %c VBT DSC parameters\n",
+				    encoder->base.base.id, encoder->base.name,
+				    port_name(encoder->port));
+
 			fill_dsc(crtc_state, devdata->dsc, dsc_max_bpc);
 
 			return true;
-- 
2.39.5