[PATCH] drm/i915/lspcon: Limits to 8 bpc for RGB/YCbCr444

[Kai-Heng Feng]

LSPCON only supports 8 bpc for RGB/YCbCr444.

Set the correct bpp otherwise it renders blank screen.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2195
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 drivers/gpu/drm/i915/display/intel_lspcon.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c b/drivers/gpu/drm/i915/display/intel_lspcon.c
index b781bf469644..c7a44fcaade8 100644
--- a/drivers/gpu/drm/i915/display/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
@@ -196,7 +196,8 @@ void lspcon_ycbcr420_config(struct drm_connector *connector,
 		crtc_state->port_clock /= 2;
 		crtc_state->output_format = INTEL_OUTPUT_FORMAT_YCBCR444;
 		crtc_state->lspcon_downsampling = true;
-	}
+	} else
+		crtc_state->pipe_bpp = 24;
 }
 
 static bool lspcon_probe(struct intel_lspcon *lspcon)
-- 
2.17.1