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_ch7017.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_ch7017.c')
| -rw-r--r-- | drivers/gpu/drm/i915/dvo_ch7017.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/dvo_ch7017.c b/drivers/gpu/drm/i915/dvo_ch7017.c index 14d59804acd7..0bc8ce1ad9aa 100644 --- a/drivers/gpu/drm/i915/dvo_ch7017.c +++ b/drivers/gpu/drm/i915/dvo_ch7017.c @@ -168,7 +168,6 @@ static void ch7017_dpms(struct intel_dvo_device *dvo, int mode); static bool ch7017_read(struct intel_dvo_device *dvo, int addr, uint8_t *val) { 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]; @@ -190,7 +189,7 @@ static bool ch7017_read(struct intel_dvo_device *dvo, int addr, uint8_t *val) out_buf[0] = addr; out_buf[1] = 0; - if (i2c_transfer(&i2cbus->adapter, msgs, 2) == 2) { + if (i2c_transfer(adapter, msgs, 2) == 2) { *val= in_buf[0]; return true; }; @@ -201,7 +200,6 @@ static bool ch7017_read(struct intel_dvo_device *dvo, int addr, uint8_t *val) static bool ch7017_write(struct intel_dvo_device *dvo, int addr, uint8_t val) { 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, @@ -213,7 +211,7 @@ static bool ch7017_write(struct intel_dvo_device *dvo, int addr, uint8_t val) out_buf[0] = addr; out_buf[1] = val; - if (i2c_transfer(&i2cbus->adapter, &msg, 1) == 1) + if (i2c_transfer(adapter, &msg, 1) == 1) return true; return false; @@ -223,7 +221,6 @@ static bool ch7017_write(struct intel_dvo_device *dvo, int addr, uint8_t val) static bool ch7017_init(struct intel_dvo_device *dvo, struct i2c_adapter *adapter) { - struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter); struct ch7017_priv *priv; uint8_t val; @@ -242,7 +239,7 @@ static bool ch7017_init(struct intel_dvo_device *dvo, val != CH7019_DEVICE_ID_VALUE) { DRM_DEBUG_KMS("ch701x not detected, got %d: from %s " "Slave %d.\n", - val, i2cbus->adapter.name,dvo->slave_addr); + val, adapter->name,dvo->slave_addr); goto fail; } |