drm/i915: Add HSW CRT output readout support

Call intel_ddi_get_config() to get the pipe_bpp settings from
DDI.

The sync polarity settings from DDI are irrelevant for CRT
output, so override them with data from the ADPA register.

v2: Extract intel_crt_get_flags()

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=69691
Tested-by: Qingshuai Tian <qingshuai.tian@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

3 files changed, 32 insertions, 8 deletions

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index f9a5f3d1f0cd..019c4cea7bb0 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -83,13 +83,11 @@ static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
         return true;
 }
 
-static void intel_crt_get_config(struct intel_encoder *encoder,
-                                 struct intel_crtc_config *pipe_config)
+static unsigned int intel_crt_get_flags(struct intel_encoder *encoder)
 {
         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
         struct intel_crt *crt = intel_encoder_to_crt(encoder);
         u32 tmp, flags = 0;
-        int dotclock;
 
         tmp = I915_READ(crt->adpa_reg);
 
@@ -103,16 +101,37 @@ static void intel_crt_get_config(struct intel_encoder *encoder,
         else
                 flags |= DRM_MODE_FLAG_NVSYNC;
 
-        pipe_config->adjusted_mode.flags |= flags;
+        return flags;
+}
+
+static void intel_crt_get_config(struct intel_encoder *encoder,
+                                 struct intel_crtc_config *pipe_config)
+{
+        struct drm_device *dev = encoder->base.dev;
+        int dotclock;
+
+        pipe_config->adjusted_mode.flags |= intel_crt_get_flags(encoder);
 
         dotclock = pipe_config->port_clock;
 
-        if (HAS_PCH_SPLIT(dev_priv->dev))
+        if (HAS_PCH_SPLIT(dev))
                 ironlake_check_encoder_dotclock(pipe_config, dotclock);
 
         pipe_config->adjusted_mode.clock = dotclock;
 }
 
+static void hsw_crt_get_config(struct intel_encoder *encoder,
+                               struct intel_crtc_config *pipe_config)
+{
+        intel_ddi_get_config(encoder, pipe_config);
+
+        pipe_config->adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC |
+                                              DRM_MODE_FLAG_NHSYNC |
+                                              DRM_MODE_FLAG_PVSYNC |
+                                              DRM_MODE_FLAG_NVSYNC);
+        pipe_config->adjusted_mode.flags |= intel_crt_get_flags(encoder);
+}
+
 /* Note: The caller is required to filter out dpms modes not supported by the
  * platform. */
 static void intel_crt_set_dpms(struct intel_encoder *encoder, int mode)
@@ -804,7 +823,10 @@ void intel_crt_init(struct drm_device *dev)
         crt->base.mode_set = intel_crt_mode_set;
         crt->base.disable = intel_disable_crt;
         crt->base.enable = intel_enable_crt;
-        crt->base.get_config = intel_crt_get_config;
+        if (IS_HASWELL(dev))
+                crt->base.get_config = hsw_crt_get_config;
+        else
+                crt->base.get_config = intel_crt_get_config;
         if (I915_HAS_HOTPLUG(dev))
                 crt->base.hpd_pin = HPD_CRT;
         if (HAS_DDI(dev))
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 7e9fa53a1477..a43ac3a17bdc 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1269,8 +1269,8 @@ static void intel_ddi_hot_plug(struct intel_encoder *intel_encoder)
                 intel_dp_check_link_status(intel_dp);
 }
 
-static void intel_ddi_get_config(struct intel_encoder *encoder,
-                                 struct intel_crtc_config *pipe_config)
+void intel_ddi_get_config(struct intel_encoder *encoder,
+                          struct intel_crtc_config *pipe_config)
 {
         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index fb38ef10ac5d..e7fe5f1f72df 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -828,5 +828,7 @@ extern void ironlake_check_encoder_dotclock(const struct intel_crtc_config *pipe
 
 extern bool intel_crtc_active(struct drm_crtc *crtc);
 extern void i915_disable_vga_mem(struct drm_device *dev);
+extern void intel_ddi_get_config(struct intel_encoder *encoder,
+                                 struct intel_crtc_config *pipe_config);
 
 #endif /* __INTEL_DRV_H__ */