diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2010-07-21 02:44:45 +0400 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2010-09-18 18:46:19 +0400 |
| commit | f899fc64cda8569d0529452aafc0da31c042df2e (patch) | |
| tree | 61b6d32abe3524b83abc9d8b9382e3f82225cd64 /drivers/gpu/drm/i915/dvo_ch7xxx.c | |
| parent | 373a3cf744c774478f44921c50011b896ab08f9d (diff) | |
| download | linux-f899fc64cda8569d0529452aafc0da31c042df2e.tar.xz | |
drm/i915: use GMBUS to manage i2c links
Use the GMBUS interface rather than direct bit banging to grab the EDID
over DDC (and for other forms of auxiliary communication with external
display controllers). The hope is that this method will be much faster
and more reliable than bit banging for fetching EDIDs from buggy monitors
or through switches, though we still preserve the bit banging as a
fallback in case GMBUS fails.
Based on an original patch by Jesse Barnes.
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm/i915/dvo_ch7xxx.c')
| -rw-r--r-- | drivers/gpu/drm/i915/dvo_ch7xxx.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/dvo_ch7xxx.c b/drivers/gpu/drm/i915/dvo_ch7xxx.c index 6f1944b24441..7eaa94e4ff06 100644 --- a/drivers/gpu/drm/i915/dvo_ch7xxx.c +++ b/drivers/gpu/drm/i915/dvo_ch7xxx.c @@ -113,7 +113,6 @@ static bool ch7xxx_readb(struct intel_dvo_device *dvo, int addr, uint8_t *ch) { struct ch7xxx_priv *ch7xxx= dvo->dev_priv; struct i2c_adapter *adapter = dvo->i2c_bus; - struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter); u8 out_buf[2]; u8 in_buf[2]; @@ -135,14 +134,14 @@ static bool ch7xxx_readb(struct intel_dvo_device *dvo, int addr, uint8_t *ch) out_buf[0] = addr; out_buf[1] = 0; - if (i2c_transfer(&i2cbus->adapter, msgs, 2) == 2) { + if (i2c_transfer(adapter, msgs, 2) == 2) { *ch = in_buf[0]; return true; }; if (!ch7xxx->quiet) { DRM_DEBUG_KMS("Unable to read register 0x%02x from %s:%02x.\n", - addr, i2cbus->adapter.name, dvo->slave_addr); + addr, adapter->name, dvo->slave_addr); } return false; } @@ -152,7 +151,6 @@ static bool ch7xxx_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch) { struct ch7xxx_priv *ch7xxx = dvo->dev_priv; struct i2c_adapter *adapter = dvo->i2c_bus; - struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter); uint8_t out_buf[2]; struct i2c_msg msg = { .addr = dvo->slave_addr, @@ -164,12 +162,12 @@ static bool ch7xxx_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch) out_buf[0] = addr; out_buf[1] = ch; - if (i2c_transfer(&i2cbus->adapter, &msg, 1) == 1) + if (i2c_transfer(adapter, &msg, 1) == 1) return true; if (!ch7xxx->quiet) { DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n", - addr, i2cbus->adapter.name, dvo->slave_addr); + addr, adapter->name, dvo->slave_addr); } return false; |