On Wed, Aug 26, 2020 at 01:21:15PM +0800, Kai-Heng Feng wrote:
LSPCON only supports 8 bpc for RGB/YCbCr444.
Set the correct bpp otherwise it renders blank screen.
Hmm. Does git://github.com/vsyrjala/linux.git dp_downstream_ports_5 work?
Actually better make that dp_downstream_ports_5^^^^^^^^^^^ aka. 54d846ce62a2 ("drm/i915: Do YCbCr 444->420 conversion via DP protocol converters") to avoid the experiments and hacks I have sitting on top.
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2195 Signed-off-by: Kai-Heng Feng kai.heng.feng@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