drm/i915/gvt: use hardcoded reference clocks

Usually I'd argue hardcoding values is the wrong thing to do, but in
this case, GVT looking deep into the guts of the DPLL manager for the
reference clocks is worse. This is done for BDW and BXT only, and there
shouldn't be any reason to try to be so dynamic about it.

This helps reduce the direct pokes at display guts from non-display
code.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Zhenyu Wang <zhenyuw.linux@gmail.com>
Link: https://lore.kernel.org/r/20250321125114.750062-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index 02f45929592e5128a2ff9b4816216773f778abcd..e6e9010462e3a5132589e5fac9d314aa65e9072e 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -514,7 +514,7 @@ static u32 bdw_vgpu_get_dp_bitrate(struct intel_vgpu *vgpu, enum port port)
 
                switch (wrpll_ctl & WRPLL_REF_MASK) {
                case WRPLL_REF_PCH_SSC:
-                       refclk = vgpu->gvt->gt->i915->display.dpll.ref_clks.ssc;
+                       refclk = 135000;
                        break;
                case WRPLL_REF_LCPLL:
                        refclk = 2700000;
@@ -545,7 +545,7 @@ out:
 static u32 bxt_vgpu_get_dp_bitrate(struct intel_vgpu *vgpu, enum port port)
 {
        u32 dp_br = 0;
-       int refclk = vgpu->gvt->gt->i915->display.dpll.ref_clks.nssc;
+       int refclk = 100000;
        enum dpio_phy phy = DPIO_PHY0;
        enum dpio_channel ch = DPIO_CH0;
        struct dpll clock = {};