drm/i915/dp: Use consistent name for link bpp and compressed bpp

Currently there are many places where we use output_bpp for link bpp and
compressed bpp.
Lets use consistent naming:
output_bpp : The intermediate value taking into account the
output_format chroma subsampling.
compressed_bpp : target bpp for the DSC encoder.
link_bpp : final bpp used in the link.

For 444 sampling without DSC:
link_bpp = output_bpp = pipe_bpp

For 420 sampling without DSC:
output_bpp = pipe_bpp / 2
link_bpp = output_bpp

For 444 sampling with DSC:
output_bpp = pipe_bpp
link_bpp = compressed_bpp, computed with output_bpp (i.e. pipe_bpp in
this case)

For 420 sampling with DSC:
output_bpp = pipe_bpp/2
link_bpp = compressed_bpp, computed with output_bpp

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230817142459.89764-5-ankit.k.nautiyal@intel.com

1 files changed, 7 insertions, 7 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index 7dd015385054..6fd423463f5c 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -107,13 +107,13 @@ void intel_read_dp_sdp(struct intel_encoder *encoder,
 		       unsigned int type);
 bool intel_digital_port_connected(struct intel_encoder *encoder);
 int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc);
-u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915,
-				u32 link_clock, u32 lane_count,
-				u32 mode_clock, u32 mode_hdisplay,
-				bool bigjoiner,
-				enum intel_output_format output_format,
-				u32 pipe_bpp,
-				u32 timeslots);
+u16 intel_dp_dsc_get_max_compressed_bpp(struct drm_i915_private *i915,
+					u32 link_clock, u32 lane_count,
+					u32 mode_clock, u32 mode_hdisplay,
+					bool bigjoiner,
+					enum intel_output_format output_format,
+					u32 pipe_bpp,
+					u32 timeslots);
 u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp,
 				int mode_clock, int mode_hdisplay,
 				bool bigjoiner);