drm/i915/skl: Implement the get_aux_clock_divider() DP vfunc

We need to provide a vfunc that will make the code in intel_dp_aux_ch()
loop once to start the AUX transaction. The return value (clock divider)
is unused on SKL, so just return 1.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 17c69101d086..4d2f704ec0a1 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -661,6 +661,16 @@ static uint32_t vlv_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
         return index ? 0 : 100;
 }
 
+static uint32_t skl_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
+{
+        /*
+         * SKL doesn't need us to program the AUX clock divider (Hardware will
+         * derive the clock from CDCLK automatically). We still implement the
+         * get_aux_clock_divider vfunc to plug-in into the existing code.
+         */
+        return index ? 0 : 1;
+}
+
 static uint32_t i9xx_get_aux_send_ctl(struct intel_dp *intel_dp,
                                       bool has_aux_irq,
                                       int send_bytes,
@@ -5083,7 +5093,9 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
         intel_dp->pps_pipe = INVALID_PIPE;
 
         /* intel_dp vfuncs */
-        if (IS_VALLEYVIEW(dev))
+        if (INTEL_INFO(dev)->gen >= 9)
+                intel_dp->get_aux_clock_divider = skl_get_aux_clock_divider;
+        else if (IS_VALLEYVIEW(dev))
                 intel_dp->get_aux_clock_divider = vlv_get_aux_clock_divider;
         else if (IS_HASWELL(dev) || IS_BROADWELL(dev))
                 intel_dp->get_aux_clock_divider = hsw_get_aux_clock_divider;