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drm/radeon/kms: Use the standard VESA timeout for DDC channels

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The VESA specification suggests a 2.2 ms timeout on DDC channels.
Use exactly that (as the i915 driver does) instead of hard-coding a
jiffy count.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Jean Delvare 2012-01-28 11:08:58 +01:00 committed by Dave Airlie
parent 1849ecb22f
commit 9048955748
1 changed files with 1 additions and 3 deletions
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4
drivers/gpu/drm/radeon/radeon_i2c.c
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@ -926,9 +926,7 @@ struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
i2c->algo.bit.getsda = get_data;
i2c->algo.bit.getscl = get_clock;
i2c->algo.bit.udelay = 10;
/* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
* make this, 2 jiffies is a lot more reliable */
i2c->algo.bit.timeout = 2;
i2c->algo.bit.timeout = usecs_to_jiffies(2200); /* from VESA */
i2c->algo.bit.data = i2c;
ret = i2c_bit_add_bus(&i2c->adapter);
if (ret) {