diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_dma.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_dma.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index db9b0c6840a0..4e3c7418729f 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -809,6 +809,37 @@ static void intel_device_info_runtime_init(struct drm_device *dev) DRM_INFO("Display fused off, disabling\n"); info->num_pipes = 0; } + } else if (info->num_pipes > 0 && INTEL_INFO(dev)->gen == 9) { + u32 dfsm = I915_READ(SKL_DFSM); + u8 disabled_mask = 0; + bool invalid; + int num_bits; + + if (dfsm & SKL_DFSM_PIPE_A_DISABLE) + disabled_mask |= BIT(PIPE_A); + if (dfsm & SKL_DFSM_PIPE_B_DISABLE) + disabled_mask |= BIT(PIPE_B); + if (dfsm & SKL_DFSM_PIPE_C_DISABLE) + disabled_mask |= BIT(PIPE_C); + + num_bits = hweight8(disabled_mask); + + switch (disabled_mask) { + case BIT(PIPE_A): + case BIT(PIPE_B): + case BIT(PIPE_A) | BIT(PIPE_B): + case BIT(PIPE_A) | BIT(PIPE_C): + invalid = true; + break; + default: + invalid = false; + } + + if (num_bits > info->num_pipes || invalid) + DRM_ERROR("invalid pipe fuse configuration: 0x%x\n", + disabled_mask); + else + info->num_pipes -= num_bits; } /* Initialize slice/subslice/EU info */ |