IPC was only added in SKL+(actually we don't even enable for SKL due
WA) so without this change, driver was writing to a reserved bit.
Also check for the WA in intel_init_ipc() to avoid further writes to
ipc_enabled.
Signed-off-by: José Roberto de Souza <jose.so...@intel.com>
---
drivers/gpu/drm/i915/intel_pm.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index e45ab21e8566..0ab10a974850 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6107,10 +6107,8 @@ void intel_enable_ipc(struct drm_i915_private *dev_priv)
u32 val;
/* Display WA #0477 WaDisableIPC: skl */
- if (IS_SKYLAKE(dev_priv)) {
- dev_priv->ipc_enabled = false;
+ if (!HAS_IPC(dev_priv) || IS_SKYLAKE(dev_priv))
return;
- }
val = I915_READ(DISP_ARB_CTL2);
@@ -6125,7 +6123,9 @@ void intel_enable_ipc(struct drm_i915_private *dev_priv)
void intel_init_ipc(struct drm_i915_private *dev_priv)
{
dev_priv->ipc_enabled = false;
- if (!HAS_IPC(dev_priv))
+
+ /* Display WA #0477 WaDisableIPC: skl */
+ if (!HAS_IPC(dev_priv) || IS_SKYLAKE(dev_priv))
return;
dev_priv->ipc_enabled = true;
--
2.18.0
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