diff options
| -rw-r--r-- | drivers/gpu/drm/i915/intel_device_info.c | 36 |
1 files changed, 13 insertions, 23 deletions
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c index 7135d8dc32a7..e64536e1fd1b 100644 --- a/drivers/gpu/drm/i915/intel_device_info.c +++ b/drivers/gpu/drm/i915/intel_device_info.c @@ -929,35 +929,25 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv) } } else if (HAS_DISPLAY(dev_priv) && INTEL_GEN(dev_priv) >= 9) { u32 dfsm = I915_READ(SKL_DFSM); - u8 disabled_mask = 0; - bool invalid; - int num_bits; + u8 enabled_mask = BIT(info->num_pipes) - 1; if (dfsm & SKL_DFSM_PIPE_A_DISABLE) - disabled_mask |= BIT(PIPE_A); + enabled_mask &= ~BIT(PIPE_A); if (dfsm & SKL_DFSM_PIPE_B_DISABLE) - disabled_mask |= BIT(PIPE_B); + enabled_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; - } + enabled_mask &= ~BIT(PIPE_C); - if (num_bits > info->num_pipes || invalid) - DRM_ERROR("invalid pipe fuse configuration: 0x%x\n", - disabled_mask); + /* + * At least one pipe should be enabled and if there are + * disabled pipes, they should be the last ones, with no holes + * in the mask. + */ + if (enabled_mask == 0 || !is_power_of_2(enabled_mask + 1)) + DRM_ERROR("invalid pipe fuse configuration: enabled_mask=0x%x\n", + enabled_mask); else - info->num_pipes -= num_bits; + info->num_pipes = hweight8(enabled_mask); } /* Initialize slice/subslice/EU info */ |