linux-kernel - [PATCH 6/9] drm/i915/intel_i2c: return -ENXIO for device NAK

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Date:	Wed,  7 Mar 2012 19:50:47 +0800
From:	Daniel Kurtz <djkurtz@...omium.org>
To:	Keith Packard <keithp@...thp.com>, David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:	Benson Leung <bleung@...omium.org>,
	Yufeng Shen <miletus@...omium.org>,
	Sameer Nanda <snanda@...omium.org>,
	Daniel Kurtz <djkurtz@...omium.org>
Subject: [PATCH 6/9] drm/i915/intel_i2c: return -ENXIO for device NAK

Return -ENXIO if a device NAKs a transaction.

Note: We should return -ETIMEDOUT, too if the transaction times out,
however, that error path is currently handled by the 'bit-bang fallback'.

Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
---
 drivers/gpu/drm/i915/intel_i2c.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index b97392c..2cdd531 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -243,6 +243,7 @@ gmbus_xfer(struct i2c_adapter *adapter,
 					       adapter);
 	struct drm_i915_private *dev_priv = adapter->algo_data;
 	int i, reg_offset;
+	int ret = 0;
 
 	if (bus->force_bit)
 		return intel_i2c_quirk_xfer(dev_priv, bus->force_bit, msgs,
@@ -333,6 +334,7 @@ clear_err:
 	 */
 	I915_WRITE(GMBUS1 + reg_offset, GMBUS_SW_CLR_INT);
 	I915_WRITE(GMBUS1 + reg_offset, 0);
+	ret = -ENXIO;
 
 done:
 	/* Mark the GMBUS interface as disabled. We will re-enable it at the
@@ -342,7 +344,7 @@ done:
 
 	mutex_unlock(&dev_priv->gmbus_mutex);
 
-	return i;
+	return ret ?: i;
 
 timeout:
 	DRM_INFO("GMBUS timed out, falling back to bit banging on pin %d [%s]\n",
-- 
1.7.7.3

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