Use MPLLA for DP2.0 rates 20G and 20G, when ssc is enabled.
Signed-off-by: Mika Kahola <mika.kahola@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_cx0_phy.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
index 55ec256c0379..e1a919803241 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
@@ -2220,8 +2220,12 @@ static void intel_program_port_clock_ctl(struct intel_encoder *encoder,
if (!intel_panel_use_ssc(i915))
ssc_enabled = false;
- /* TODO: DP2.0 10G and 20G rates enable MPLLA*/
- val |= ssc_enabled ? XELPDP_SSC_ENABLE_PLLB : 0;
+ /* DP2.0 10G and 20G rates enable MPLLA*/
+ if (crtc_state->port_clock == 1000000 || crtc_state->port_clock == 2000000) {
+ val |= ssc_enabled ? XELPDP_SSC_ENABLE_PLLA : 0;
+ } else {
+ val |= ssc_enabled ? XELPDP_SSC_ENABLE_PLLB : 0;
+ }
}
intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
--
2.34.1
