Some Gen7/8 production parts may have the Display Pipe C fused off.
In this case, the display hardware will prevent the Pipe C register bit
from being set to 1.
Fixed by adjusting pipe_count to reflect this.
v2: Rename HSW_PIPE_C_DISABLE to IVB_PIPE_C_DISABLE as it already exists
on ivybridge (Ville)
v3: Remove unnecessary MMIO read, correct the description (Damien)
Signed-off-by: Gabriel Feceoru <gabriel.feceoru@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_dma.c | 3 +++
drivers/gpu/drm/i915/i915_reg.h | 1 +
2 files changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 44a896c..dd0d100 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -813,6 +813,9 @@ static void intel_device_info_runtime_init(struct drm_device *dev)
!(sfuse_strap & SFUSE_STRAP_FUSE_LOCK))) {
DRM_INFO("Display fused off, disabling\n");
info->num_pipes = 0;
+ } else if (fuse_strap & IVB_PIPE_C_DISABLE) {
+ DRM_INFO("PipeC fused off\n");
+ info->num_pipes -= 1;
}
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0a98889..a182739 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5945,6 +5945,7 @@ enum skl_disp_power_wells {
#define ILK_INTERNAL_GRAPHICS_DISABLE (1 << 31)
#define ILK_INTERNAL_DISPLAY_DISABLE (1 << 30)
#define ILK_DISPLAY_DEBUG_DISABLE (1 << 29)
+#define IVB_PIPE_C_DISABLE (1 << 28)
#define ILK_HDCP_DISABLE (1 << 25)
#define ILK_eDP_A_DISABLE (1 << 24)
#define HSW_CDCLK_LIMIT (1 << 24)
--
1.9.1
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