diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2012-11-10 19:58:21 +0400 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-11-13 19:10:04 +0400 |
| commit | f2ce9fafc1d443d49a0d1988f524a5da6e086e2c (patch) | |
| tree | 43ca8b12502129c08dc7e88ba3376d1cd77582ed /drivers/gpu/drm/i915/intel_i2c.c | |
| parent | f94982b0022f474d3c9285447d9a33b7a324e771 (diff) | |
| download | linux-f2ce9fafc1d443d49a0d1988f524a5da6e086e2c.tar.xz | |
drm/i915/i2c: Track users of GMBUS force-bit
This fixes a regression for SDVO from
commit fbfcc4f3a0cf8bbde87646b74241faa8e37426bf
Author: Jani Nikula <jani.nikula@intel.com>
Date: Mon Oct 22 16:12:18 2012 +0300
drm/i915/sdvo: restore i2c adapter config on intel_sdvo_init() failures
As SDVOB and SDVOC are multiplexed on the same pin, if a chipset does
not have the second SDVO encoder, it will then remove the force-bit
setting on the common i2c adapter during teardown. All subsequent
attempts of trying to use GMBUS with SDVOB then fail.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
[danvet: fixup inversion in the debug printout, noticed by Jani
Nikulai.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_i2c.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_i2c.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c index c2c6dbc0971c..3ef5af15b812 100644 --- a/drivers/gpu/drm/i915/intel_i2c.c +++ b/drivers/gpu/drm/i915/intel_i2c.c @@ -432,7 +432,7 @@ timeout: I915_WRITE(GMBUS0 + reg_offset, 0); /* Hardware may not support GMBUS over these pins? Try GPIO bitbanging instead. */ - bus->force_bit = true; + bus->force_bit = 1; ret = i2c_bit_algo.master_xfer(adapter, msgs, num); out: @@ -491,7 +491,7 @@ int intel_setup_gmbus(struct drm_device *dev) /* gmbus seems to be broken on i830 */ if (IS_I830(dev)) - bus->force_bit = true; + bus->force_bit = 1; intel_gpio_setup(bus, port); @@ -532,7 +532,10 @@ void intel_gmbus_force_bit(struct i2c_adapter *adapter, bool force_bit) { struct intel_gmbus *bus = to_intel_gmbus(adapter); - bus->force_bit = force_bit; + bus->force_bit += force_bit ? 1 : -1; + DRM_DEBUG_KMS("%sabling bit-banging on %s. force bit now %d\n", + force_bit ? "en" : "dis", adapter->name, + bus->force_bit); } void intel_teardown_gmbus(struct drm_device *dev) |