diff options
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_i2c.c | 10 |
2 files changed, 8 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index a9c8211c8e5e..6c45adb6dce9 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -996,6 +996,7 @@ struct intel_fbc_work; struct intel_gmbus { struct i2c_adapter adapter; +#define GMBUS_FORCE_BIT_RETRY (1U << 31) u32 force_bit; u32 reg0; i915_reg_t gpio_reg; diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c index c5d5010284e2..f8bd98c1cc71 100644 --- a/drivers/gpu/drm/i915/intel_i2c.c +++ b/drivers/gpu/drm/i915/intel_i2c.c @@ -579,7 +579,6 @@ timeout: * Hardware may not support GMBUS over these pins? Try GPIO bitbanging * instead. Use EAGAIN to have i2c core retry. */ - bus->force_bit = 1; ret = -EAGAIN; out: @@ -597,10 +596,15 @@ gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS); mutex_lock(&dev_priv->gmbus_mutex); - if (bus->force_bit) + if (bus->force_bit) { ret = i2c_bit_algo.master_xfer(adapter, msgs, num); - else + if (ret < 0) + bus->force_bit &= ~GMBUS_FORCE_BIT_RETRY; + } else { ret = do_gmbus_xfer(adapter, msgs, num); + if (ret == -EAGAIN) + bus->force_bit |= GMBUS_FORCE_BIT_RETRY; + } mutex_unlock(&dev_priv->gmbus_mutex); intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS); |