drm/i915/icl: Ungate DSI clocks

Ungate the clocks on the selected port.

Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Signed-off-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/2a01b3158feda624f98581b780854fe3df8c328d.1543500286.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
index e42a99fda1915aeb57c2c507ec73c0eebf210828..e3aa9d3d2291d5abc6628af6a1fcb960c69f9a72 100644 (file)
--- a/drivers/gpu/drm/i915/icl_dsi.c
+++ b/drivers/gpu/drm/i915/icl_dsi.c
@@ -553,6 +553,23 @@ static void gen11_dsi_gate_clocks(struct intel_encoder *encoder)
        mutex_unlock(&dev_priv->dpll_lock);
 }
 
+static void gen11_dsi_ungate_clocks(struct intel_encoder *encoder)
+{
+       struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+       struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+       u32 tmp;
+       enum port port;
+
+       mutex_lock(&dev_priv->dpll_lock);
+       tmp = I915_READ(DPCLKA_CFGCR0_ICL);
+       for_each_dsi_port(port, intel_dsi->ports) {
+               tmp &= ~DPCLKA_CFGCR0_DDI_CLK_OFF(port);
+       }
+
+       I915_WRITE(DPCLKA_CFGCR0_ICL, tmp);
+       mutex_unlock(&dev_priv->dpll_lock);
+}
+
 static void
 gen11_dsi_configure_transcoder(struct intel_encoder *encoder,
                               const struct intel_crtc_state *pipe_config)
@@ -1061,6 +1078,7 @@ static void gen11_dsi_disable_port(struct intel_encoder *encoder)
        u32 tmp;
        enum port port;
 
+       gen11_dsi_ungate_clocks(encoder);
        for_each_dsi_port(port, intel_dsi->ports) {
                tmp = I915_READ(DDI_BUF_CTL(port));
                tmp &= ~DDI_BUF_CTL_ENABLE;
@@ -1072,6 +1090,7 @@ static void gen11_dsi_disable_port(struct intel_encoder *encoder)
                        DRM_ERROR("DDI port:%c buffer not idle\n",
                                  port_name(port));
        }
+       gen11_dsi_ungate_clocks(encoder);
 }
 
 static void gen11_dsi_disable_io_power(struct intel_encoder *encoder)