We enable SSC when we program PORT_CLOCK_CTL register. We logically determine if ssc is enabled or not while we calculate our state.
Bspec: 74492, 74667 Signed-off-by: Suraj Kandpal <[email protected]> Reviewed-by: Arun R Murthy <[email protected]> --- drivers/gpu/drm/i915/display/intel_lt_phy.c | 26 +++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_lt_phy.c b/drivers/gpu/drm/i915/display/intel_lt_phy.c index c790fe652aa0..0b1b320f5c3a 100644 --- a/drivers/gpu/drm/i915/display/intel_lt_phy.c +++ b/drivers/gpu/drm/i915/display/intel_lt_phy.c @@ -16,6 +16,7 @@ #include "intel_hdmi.h" #include "intel_lt_phy.h" #include "intel_lt_phy_regs.h" +#include "intel_panel.h" #include "intel_psr.h" #include "intel_tc.h" @@ -1110,6 +1111,12 @@ intel_lt_phy_program_port_clock_ctl(struct intel_encoder *encoder, else val |= XELPDP_DDI_CLOCK_SELECT_PREP(display, XELPDP_DDI_CLOCK_SELECT_MAXPCLK); + /* DP2.0 10G and 20G rates enable MPLLA*/ + if (crtc_state->port_clock == 1000000 || crtc_state->port_clock == 2000000) + val |= XELPDP_SSC_ENABLE_PLLA; + else + val |= crtc_state->dpll_hw_state.ltpll.ssc_enabled ? XELPDP_SSC_ENABLE_PLLB : 0; + intel_de_rmw(display, XELPDP_PORT_CLOCK_CTL(display, encoder->port), XELPDP_LANE1_PHY_CLOCK_SELECT | XELPDP_FORWARD_CLOCK_UNGATE | XELPDP_DDI_CLOCK_SELECT_MASK(display) | XELPDP_SSC_ENABLE_PLLA | @@ -1213,6 +1220,23 @@ intel_lt_phy_pll_tables_get(struct intel_crtc_state *crtc_state, return NULL; } +static bool +intel_lt_phy_pll_is_ssc_enabled(struct intel_crtc_state *crtc_state, + struct intel_encoder *encoder) +{ + struct intel_display *display = to_intel_display(encoder); + + if (intel_crtc_has_dp_encoder(crtc_state)) { + if (intel_panel_use_ssc(display)) { + struct intel_dp *intel_dp = enc_to_intel_dp(encoder); + + return (intel_dp->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5); + } + } + + return false; +} + int intel_lt_phy_pll_calc_state(struct intel_crtc_state *crtc_state, struct intel_encoder *encoder) @@ -1231,6 +1255,8 @@ intel_lt_phy_pll_calc_state(struct intel_crtc_state *crtc_state, if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP)) crtc_state->dpll_hw_state.ltpll.config[2] = 1; } + crtc_state->dpll_hw_state.ltpll.ssc_enabled = + intel_lt_phy_pll_is_ssc_enabled(crtc_state, encoder); return 0; } } -- 2.34.1
