drm/i915: Make sure the primary plane is enabled before reading out the fb state

We don't want to end up in a state where we track that the pipe has its
primary plane enabled when primary plane registers are programmed with
values that look possible but the plane actually disabled.

Refuse to read out the fb state when the primary plane isn't enabled.

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Suggested-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reported-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Reference: http://mid.gmane.org/20150203191507.GA2374@crion86
Tested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2de362be885a67f9bf66b966e9a776d72dcac5d9..6d22128d97b1b8ce732208fe93ed897dc0a2cdcd 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6613,6 +6613,10 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
        struct drm_framebuffer *fb;
        struct intel_framebuffer *intel_fb;
 
+       val = I915_READ(DSPCNTR(plane));
+       if (!(val & DISPLAY_PLANE_ENABLE))
+               return;
+
        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
        if (!intel_fb) {
                DRM_DEBUG_KMS("failed to alloc fb\n");
@@ -6621,8 +6625,6 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
 
        fb = &intel_fb->base;
 
-       val = I915_READ(DSPCNTR(plane));
-
        if (INTEL_INFO(dev)->gen >= 4)
                if (val & DISPPLANE_TILED)
                        plane_config->tiling = I915_TILING_X;
@@ -7655,6 +7657,9 @@ skylake_get_initial_plane_config(struct intel_crtc *crtc,
        fb = &intel_fb->base;
 
        val = I915_READ(PLANE_CTL(pipe, 0));
+       if (!(val & PLANE_CTL_ENABLE))
+               goto error;
+
        if (val & PLANE_CTL_TILED_MASK)
                plane_config->tiling = I915_TILING_X;
 
@@ -7743,6 +7748,10 @@ ironlake_get_initial_plane_config(struct intel_crtc *crtc,
        struct drm_framebuffer *fb;
        struct intel_framebuffer *intel_fb;
 
+       val = I915_READ(DSPCNTR(pipe));
+       if (!(val & DISPLAY_PLANE_ENABLE))
+               return;
+
        intel_fb = kzalloc(sizeof(*intel_fb), GFP_KERNEL);
        if (!intel_fb) {
                DRM_DEBUG_KMS("failed to alloc fb\n");
@@ -7751,8 +7760,6 @@ ironlake_get_initial_plane_config(struct intel_crtc *crtc,
 
        fb = &intel_fb->base;
 
-       val = I915_READ(DSPCNTR(pipe));
-
        if (INTEL_INFO(dev)->gen >= 4)
                if (val & DISPPLANE_TILED)
                        plane_config->tiling = I915_TILING_X;