We might to use that function separately from intel_dp_dsc_compute_config
for DP DSC over MST case, because allocating bandwidth in that
case can be a bit more tricky. So in order to avoid code copy-pasta
lets extract this to separate function and reuse it for both SST
and MST cases.
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp.c | 51 ++++++++++++++++---------
drivers/gpu/drm/i915/display/intel_dp.h | 1 +
2 files changed, 33 insertions(+), 19 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 70f4d6422795..71e08e665065 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -671,6 +671,37 @@ small_joiner_ram_size_bits(struct drm_i915_private *i915)
return 6144 * 8;
}
+u32 intel_dp_dsc_nearest_vesa_bpp(struct drm_i915_private *i915, u32 bpp, u32 pipe_bpp)
+{
+ u32 bits_per_pixel = bpp;
+ int i;
+
+ /* Error out if the max bpp is less than smallest allowed valid bpp */
+ if (bits_per_pixel < valid_dsc_bpp[0]) {
+ drm_dbg_kms(&i915->drm, "Unsupported BPP %u, min %u\n",
+ bits_per_pixel, valid_dsc_bpp[0]);
+ return 0;
+ }
+
+ /* From XE_LPD onwards we support from bpc upto uncompressed bpp-1 BPPs */
+ if (DISPLAY_VER(i915) >= 13) {
+ bits_per_pixel = min(bits_per_pixel, pipe_bpp - 1);
+ } else {
+ /* Find the nearest match in the array of known BPPs from VESA */
+ for (i = 0; i < ARRAY_SIZE(valid_dsc_bpp) - 1; i++) {
+ if (bits_per_pixel < valid_dsc_bpp[i + 1])
+ break;
+ }
+ drm_dbg_kms(&i915->drm, "Set dsc bpp from %d to VESA %d\n",
+ bits_per_pixel, valid_dsc_bpp[i]);
+
+ bits_per_pixel = valid_dsc_bpp[i];
+ }
+
+ return bits_per_pixel;
+}
+
+
u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915,
u32 link_clock, u32 lane_count,
u32 mode_clock, u32 mode_hdisplay,
@@ -679,7 +710,6 @@ u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915,
u32 timeslots)
{
u32 bits_per_pixel, max_bpp_small_joiner_ram;
- int i;
/*
* Available Link Bandwidth(Kbits/sec) = (NumberOfLanes)*
@@ -712,24 +742,7 @@ u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915,
bits_per_pixel = min(bits_per_pixel, max_bpp_bigjoiner);
}
- /* Error out if the max bpp is less than smallest allowed valid bpp */
- if (bits_per_pixel < valid_dsc_bpp[0]) {
- drm_dbg_kms(&i915->drm, "Unsupported BPP %u, min %u\n",
- bits_per_pixel, valid_dsc_bpp[0]);
- return 0;
- }
-
- /* From XE_LPD onwards we support from bpc upto uncompressed bpp-1 BPPs */
- if (DISPLAY_VER(i915) >= 13) {
- bits_per_pixel = min(bits_per_pixel, pipe_bpp - 1);
- } else {
- /* Find the nearest match in the array of known BPPs from VESA */
- for (i = 0; i < ARRAY_SIZE(valid_dsc_bpp) - 1; i++) {
- if (bits_per_pixel < valid_dsc_bpp[i + 1])
- break;
- }
- bits_per_pixel = valid_dsc_bpp[i];
- }
+ bits_per_pixel = intel_dp_dsc_nearest_vesa_bpp(i915, bits_per_pixel, pipe_bpp);
/*
* Compressed BPP in U6.4 format so multiply by 16, for Gen 11,
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index c6539a6915e9..0fe10d93b75c 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -120,6 +120,7 @@ static inline unsigned int intel_dp_unused_lane_mask(int lane_count)
}
u32 intel_dp_mode_to_fec_clock(u32 mode_clock);
+u32 intel_dp_dsc_nearest_vesa_bpp(struct drm_i915_private *i915, u32 bpp, u32 pipe_bpp);
void intel_ddi_update_pipe(struct intel_atomic_state *state,
struct intel_encoder *encoder,
--
2.37.3
