[Intel-gfx] [PATCH 11/11] drm/i915/dsc: Allow DSC only with fractional bpp when forced from debugfs

[Ankit Nautiyal]

From: Swati Sharma <swati2.sha...@intel.com>

If force_dsc_fractional_bpp_en is set through debugfs allow DSC iff
compressed bpp is fractional. Continue if we computed compressed bpp is
computed as integer.

Signed-off-by: Swati Sharma <swati2.sha...@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c 
b/drivers/gpu/drm/i915/display/intel_dp.c
index 379dd683be0a..5ed7471247ad 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1591,6 +1591,9 @@ static int dsc_compute_compressed_bpp(struct intel_dp 
*intel_dp,
        for (compressed_bppx16 = dsc_max_bppx16;
             compressed_bppx16 >= dsc_min_bppx16;
             compressed_bppx16 -= bppx16_step) {
+               if (intel_dp->force_dsc_fractional_bpp_en &&
+                   (compressed_bppx16 % 16 == 0))
+                       continue;
                ret = dsc_compute_link_config(intel_dp,
                                              pipe_config,
                                              limits,
@@ -1709,6 +1712,9 @@ static int intel_dp_dsc_compute_config(struct intel_dp 
*intel_dp,
        } else {
                u8 dsc_dp_slice_count;
 
+               if (intel_dp->force_dsc_fractional_bpp_en)
+                       drm_dbg_kms(&dev_priv->drm,
+                                   "Forcing DSC fractional bpp\n");
                if (intel_dp->force_dsc_bpc &&
                    intel_dp->force_dsc_bpc <= conn_state->max_requested_bpc)
                        ret = dsc_compute_compressed_bpp(intel_dp, pipe_config,
-- 
2.25.1