48 lines
1.6 KiB
Diff
48 lines
1.6 KiB
Diff
From cee25168e9c4ef7f9417632af2dc78b8521dfda7 Mon Sep 17 00:00:00 2001
|
|
From: Jani Nikula <jani.nikula@intel.com>
|
|
Date: Mon, 13 Aug 2012 17:33:02 +0300
|
|
Subject: [PATCH] drm/i915: ensure i2c adapter is all set before adding it
|
|
|
|
i2c_add_adapter() may do i2c transfers on the bus to detect supported
|
|
devices. Therefore the adapter needs to be all set before adding it. This
|
|
was not the case for the bit-banging fallback, resulting in an oops if the
|
|
device detection GMBUS transfers timed out. Fix the issue by calling
|
|
i2c_add_adapter() only after intel_gpio_setup().
|
|
|
|
LKML-Reference: <5021F00B.7000503@ionic.de>
|
|
Tested-by: Mihai Moldovan <ionic@ionic.de>
|
|
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
|
|
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
|
|
---
|
|
drivers/gpu/drm/i915/intel_i2c.c | 7 ++++---
|
|
1 files changed, 4 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
|
|
index d79500b..b9755f6 100644
|
|
--- a/drivers/gpu/drm/i915/intel_i2c.c
|
|
+++ b/drivers/gpu/drm/i915/intel_i2c.c
|
|
@@ -486,9 +486,6 @@ int intel_setup_gmbus(struct drm_device *dev)
|
|
bus->dev_priv = dev_priv;
|
|
|
|
bus->adapter.algo = &gmbus_algorithm;
|
|
- ret = i2c_add_adapter(&bus->adapter);
|
|
- if (ret)
|
|
- goto err;
|
|
|
|
/* By default use a conservative clock rate */
|
|
bus->reg0 = port | GMBUS_RATE_100KHZ;
|
|
@@ -498,6 +495,10 @@ int intel_setup_gmbus(struct drm_device *dev)
|
|
bus->force_bit = true;
|
|
|
|
intel_gpio_setup(bus, port);
|
|
+
|
|
+ ret = i2c_add_adapter(&bus->adapter);
|
|
+ if (ret)
|
|
+ goto err;
|
|
}
|
|
|
|
intel_i2c_reset(dev_priv->dev);
|
|
--
|
|
1.7.7.6
|
|
|