diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2016-10-12 14:44:47 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2016-10-17 14:26:42 +0300 |
| commit | 862372bc8fefb7bdc243dd120448b970244c8185 (patch) | |
| tree | 52577b9562cc3f502c50aa90f84b80e8c8dfdb15 /drivers/gpu/drm/i915/intel_i2c.c | |
| parent | 06a75ace46e2fdd1d93b06228df0e2dfe526cc27 (diff) | |
| download | linux-862372bc8fefb7bdc243dd120448b970244c8185.tar.xz | |
drm/i915: GMBUS don't need no forcewake
GMBUS is part of the display engine, and thus has no need for
forcewake. Let's not bother trying to grab it then.
I don't recall if the display engine suffers from system hangs
due to multiple accesses to the same "cacheline" in mmio space.
I hope not since we're no longer protected by the uncore lock
since commit 4e6c2d58ba86 ("drm/i915: Take forcewake once for
the entire GMBUS transaction")
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: David Weinehall <david.weinehall@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1476272687-15070-1-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_i2c.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_i2c.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c index d04185e1edd6..83f260bb4eef 100644 --- a/drivers/gpu/drm/i915/intel_i2c.c +++ b/drivers/gpu/drm/i915/intel_i2c.c @@ -467,13 +467,9 @@ do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) struct intel_gmbus, adapter); struct drm_i915_private *dev_priv = bus->dev_priv; - const unsigned int fw = - intel_uncore_forcewake_for_reg(dev_priv, GMBUS0, - FW_REG_READ | FW_REG_WRITE); int i = 0, inc, try = 0; int ret = 0; - intel_uncore_forcewake_get(dev_priv, fw); retry: I915_WRITE_FW(GMBUS0, bus->reg0); @@ -575,7 +571,6 @@ timeout: ret = -EAGAIN; out: - intel_uncore_forcewake_put(dev_priv, fw); return ret; } |