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drm/i915: Do not modifiy reserved bit in gens that do not have IPC 

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 removing the uncessary dev_priv->ipc_enabled = false; as now
gens without IPC will not have IPC enabled.

v2(Rodrigo):
- moved the new handling of WA #0477 to the next patch

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180918204714.27306-3-jose.souza@intel.com
This commit is contained in:
José Roberto de Souza 2018-09-18 13:47:11 -07:00 committed by Rodrigo Vivi
parent 6edafc4eb3
commit fd847b8e60
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/intel_pm.c
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@ -6117,6 +6117,9 @@ void intel_enable_ipc(struct drm_i915_private *dev_priv)
{
u32 val;
if (!HAS_IPC(dev_priv))
return;
/* Display WA #0477 WaDisableIPC: skl */
if (IS_SKYLAKE(dev_priv))
dev_priv->ipc_enabled = false;
@ -6138,7 +6141,6 @@ 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))
return;