Some DSI panel vendors end up hardcoding PPS params because of which it does not listen to the params sent from the source. We use the default config tables for DSI panels when using DSC 1.1 rather than calculate our own rc parameters. --v2 -Use intel_crtc_has_type [Jani] --v4 -Use a function to check Mipi dsi dsc 1.1 condition [Ankit] -Add documentation for using this condition [Ankit] -Rebase --v5 -Pass only the crtc_state [Jani] -Fixup the comment [Jani] -Check for dsc major version [Jani] -Use co-developed-by tag [Jani] Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/13719 Co-developed-by: William Tseng <william.tseng@xxxxxxxxx> Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_vdsc.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c index 3ed64c17bdff..04ba9f6b7ea2 100644 --- a/drivers/gpu/drm/i915/display/intel_vdsc.c +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c @@ -259,6 +259,15 @@ static int intel_dsc_slice_dimensions_valid(struct intel_crtc_state *pipe_config return 0; } +static bool is_dsi_dsc_1_1(struct intel_crtc_state *crtc_state) +{ + struct drm_dsc_config *vdsc_cfg = &crtc_state->dsc.config; + + return vdsc_cfg->dsc_version_major == 1 && + vdsc_cfg->dsc_version_minor == 1 && + intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI); +} + int intel_dsc_compute_params(struct intel_crtc_state *pipe_config) { struct intel_display *display = to_intel_display(pipe_config); @@ -317,8 +326,14 @@ int intel_dsc_compute_params(struct intel_crtc_state *pipe_config) * From XE_LPD onwards we supports compression bpps in steps of 1 * upto uncompressed bpp-1, hence add calculations for all the rc * parameters + * + * We also don't want to calculate all rc parameters when the panel + * is MIPI DSI and it's using DSC 1.1. The reason being that some + * DSI panels vendors have hardcoded PPS params in the VBT causing + * the parameters sent from the source to be ignore. This causes a + * noise in the display. */ - if (DISPLAY_VER(display) >= 13) { + if (DISPLAY_VER(display) >= 13 && !is_dsi_dsc_1_1(pipe_config)) { calculate_rc_params(vdsc_cfg); } else { if ((compressed_bpp == 8 || -- 2.34.1
