[PATCH 08/25] drm/i915: Do not modifiy reserved bit in gens that do not have IPC
José Roberto de Souza
jose.souza at intel.com
Mon Aug 6 23:14:37 UTC 2018
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.souza at 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 7172d650b9a8..c5d5873253f5 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6082,10 +6082,8 @@ 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);
@@ -6100,7 +6098,9 @@ 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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