[PATCH] drm/i915/vdsc: Add bpc check in intel_dsc_compute_params

[Suraj Kandpal]

DSC does not support bpc under 8 according to DSC 1.2a Section 2
Requirements. Return an error if that happens to be the case.

--v2
-should be bits_per_component [Mitul/Chaitanya/Srikanth]
-Add reference to this restriction [Chaitanya]

Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_vdsc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
index 8158e3702ed5..7a30fdea16da 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -306,6 +306,11 @@ int intel_dsc_compute_params(struct intel_crtc_state *pipe_config)
 
 	vdsc_cfg->bits_per_component = pipe_config->pipe_bpp / 3;
 
+	if (vdsc_cfg->bits_per_component < 8) {
+		drm_dbg_kms(&dev_priv->drm, "DSC bpc requirements not met\n");
+		return -EINVAL;
+	}
+
 	drm_dsc_set_rc_buf_thresh(vdsc_cfg);
 
 	/*
-- 
2.43.2