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drm/i915: sanitize enable_rc6 option 

Atm, an invalid enable_rc6 module option will be silently ignored, so
emit an info message about it. Doing an early sanitization we can also
reuse intel_enable_rc6() in a follow-up patch to see if RC6 is actually
enabled. Currently the caller would have to filter a non-zero return
value based on the platform we are running on. For example on VLV with
i915.enable_rc6 set to 2, RC6 won't be enabled but atm
intel_enable_rc6() would still return 2 in this case.

v2:
- simplify the platform check condition (Ville)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Imre Deak 2014-04-18 16:01:02 +03:00 committed by Daniel Vetter
parent 14dd0ea84d
commit e6069ca84d
1 changed files with 27 additions and 3 deletions
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30
drivers/gpu/drm/i915/intel_pm.c
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@ -3262,15 +3262,32 @@ static void intel_print_rc6_info(struct drm_device *dev, u32 mode)
(mode & GEN6_RC_CTL_RC6pp_ENABLE) ? "on" : "off");
}
int intel_enable_rc6(const struct drm_device *dev)
static int sanitize_rc6_option(const struct drm_device *dev, int enable_rc6)
{
/* No RC6 before Ironlake */
if (INTEL_INFO(dev)->gen < 5)
return 0;
/* RC6 is only on Ironlake mobile not on desktop */
if (INTEL_INFO(dev)->gen == 5 && !IS_IRONLAKE_M(dev))
return 0;
/* Respect the kernel parameter if it is set */
if (i915.enable_rc6 >= 0)
return i915.enable_rc6;
if (enable_rc6 >= 0) {
int mask;
if (INTEL_INFO(dev)->gen == 6 || IS_IVYBRIDGE(dev))
mask = INTEL_RC6_ENABLE | INTEL_RC6p_ENABLE |
INTEL_RC6pp_ENABLE;
else
mask = INTEL_RC6_ENABLE;
if ((enable_rc6 & mask) != enable_rc6)
DRM_INFO("Adjusting RC6 mask to %d (requested %d, valid %d)\n",
enable_rc6, enable_rc6 & mask, mask);
return enable_rc6 & mask;
}
/* Disable RC6 on Ironlake */
if (INTEL_INFO(dev)->gen == 5)
@ -3282,6 +3299,11 @@ int intel_enable_rc6(const struct drm_device *dev)
return INTEL_RC6_ENABLE;
}
int intel_enable_rc6(const struct drm_device *dev)
{
return i915.enable_rc6;
}
static void gen6_enable_rps_interrupts(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -4496,6 +4518,8 @@ static void intel_init_emon(struct drm_device *dev)
void intel_init_gt_powersave(struct drm_device *dev)
{
i915.enable_rc6 = sanitize_rc6_option(dev, i915.enable_rc6);
if (IS_VALLEYVIEW(dev))
valleyview_setup_pctx(dev);
}