From: Chris Wilson Date: Sat, 10 Nov 2012 15:58:21 +0000 (+0000) Subject: drm/i915/i2c: Track users of GMBUS force-bit X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f2ce9fafc1d443d49a0d1988f524a5da6e086e2c;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git drm/i915/i2c: Track users of GMBUS force-bit This fixes a regression for SDVO from commit fbfcc4f3a0cf8bbde87646b74241faa8e37426bf Author: Jani Nikula 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 Cc: Jani Nikula Cc: Mika Kuoppala [danvet: fixup inversion in the debug printout, noticed by Jani Nikulai.] Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index f316916fe65e..db6d71c8997e 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -390,7 +390,7 @@ struct intel_fbc_work; struct intel_gmbus { struct i2c_adapter adapter; - bool force_bit; + u32 force_bit; u32 reg0; u32 gpio_reg; struct i2c_algo_bit_data bit_algo; 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)