drm/i915: Add lspcon resume function

As per the software design, we are driving lspcon in
PCON mode. But while resuming from suspend, lspcon can go
in LS mode (which is its default operating mode on power on)

This patch adds a resume function for lspcon, which makes sure
its operating in PCON mode, post resume.

V2: Address review comments from Imre
	- move lspcon_resume call to encoder->reset()
	- use early returns

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1476455212-27893-6-git-send-email-shashank.sharma@intel.com

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 780691a3413335a399ad37ffa07d8507d7075592..88f3b745a326c447ff7ea7f46c524789e8b228ca 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4780,11 +4780,16 @@ static void intel_edp_panel_vdd_sanitize(struct intel_dp *intel_dp)
 void intel_dp_encoder_reset(struct drm_encoder *encoder)
 {
        struct drm_i915_private *dev_priv = to_i915(encoder->dev);
-       struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+       struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
+       struct intel_lspcon *lspcon = &intel_dig_port->lspcon;
+       struct intel_dp *intel_dp = &intel_dig_port->dp;
 
        if (!HAS_DDI(dev_priv))
                intel_dp->DP = I915_READ(intel_dp->output_reg);
 
+       if (IS_GEN9(dev_priv) && lspcon->active)
+               lspcon_resume(lspcon);
+
        if (to_intel_encoder(encoder)->type != INTEL_OUTPUT_EDP)
                return;
 

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index ab1e6213df3db7d51018591bc28339e01a0801c1..5760420ace61a293340ed86d689d61848be9c643 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1857,4 +1857,5 @@ void intel_color_load_luts(struct drm_crtc_state *crtc_state);
 
 /* intel_lspcon.c */
 bool lspcon_init(struct intel_digital_port *intel_dig_port);
+void lspcon_resume(struct intel_lspcon *lspcon);
 #endif /* __INTEL_DRV_H__ */

diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
index 628ae6fbdcb1200727a25719b15ea01ab8abf4be..d606f1a8f3b686e6d9a449126fd8f76dc668c38a 100644 (file)
--- a/drivers/gpu/drm/i915/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/intel_lspcon.c
@@ -89,6 +89,14 @@ static bool lspcon_probe(struct intel_lspcon *lspcon)
        return true;
 }
 
+void lspcon_resume(struct intel_lspcon *lspcon)
+{
+       if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON, true))
+               DRM_ERROR("LSPCON resume failed\n");
+       else
+               DRM_DEBUG_KMS("LSPCON resume success\n");
+}
+
 bool lspcon_init(struct intel_digital_port *intel_dig_port)
 {
        struct intel_dp *dp = &intel_dig_port->dp;