drm/i915/icl: Put DSI link in ULPS

As part of DSI disabling sequence, DSI link need to enter
in ULPS by writing into DSI_LP_MSG register. This patch
does the same using a wrapper function.

Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/50812f4bd37f95c053bef7eef4a95e5da029546f.1540900289.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
index a7b1a9e..83c422d 100644 (file)
--- a/drivers/gpu/drm/i915/icl_dsi.c
+++ b/drivers/gpu/drm/i915/icl_dsi.c
@@ -812,6 +812,29 @@ static void gen11_dsi_powerdown_panel(struct intel_encoder *encoder)
        wait_for_cmds_dispatched_to_panel(encoder);
 }
 
+static void gen11_dsi_deconfigure_trancoder(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);
+       enum port port;
+       enum transcoder dsi_trans;
+       u32 tmp;
+
+       /* put dsi link in ULPS */
+       for_each_dsi_port(port, intel_dsi->ports) {
+               dsi_trans = dsi_port_to_transcoder(port);
+               tmp = I915_READ(DSI_LP_MSG(dsi_trans));
+               tmp |= LINK_ENTER_ULPS;
+               tmp &= ~LINK_ULPS_TYPE_LP11;
+               I915_WRITE(DSI_LP_MSG(dsi_trans), tmp);
+
+               if (wait_for_us((I915_READ(DSI_LP_MSG(dsi_trans)) &
+                               LINK_IN_ULPS),
+                               10))
+                       DRM_ERROR("DSI link not in ULPS\n");
+       }
+}
+
 static void __attribute__((unused)) gen11_dsi_disable(
                        struct intel_encoder *encoder,
                        const struct intel_crtc_state *old_crtc_state,
@@ -828,4 +851,7 @@ static void __attribute__((unused)) gen11_dsi_disable(
 
        /* step2f,g: powerdown panel */
        gen11_dsi_powerdown_panel(encoder);
+
+       /* step2h,i,j: deconfig trancoder */
+       gen11_dsi_deconfigure_trancoder(encoder);
 }