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drm/radeon: Properly handle DDC probe for DP bridges

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DDC information can be accessed using AUX CH

Fixes failure to probe monitors on some systems with
DP bridge chips.

agd5f: minor fixes

Signed-off-by: Niels Ole Salscheider <niels_ole@salscheider-online.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Niels Ole Salscheider
2013-01-03 19:09:28 +01:00
committed by Alex Deucher
parent 64c56e8ce3
commit 0a9069d349
4 changed files with 24 additions and 11 deletions
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10
drivers/gpu/drm/radeon/radeon_i2c.c
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@@ -39,7 +39,7 @@ extern u32 radeon_atom_hw_i2c_func(struct i2c_adapter *adap);
* radeon_ddc_probe
*
*/
bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool use_aux)
{
u8 out = 0x0;
u8 buf[8];
@@ -63,7 +63,13 @@ bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
if (radeon_connector->router.ddc_valid)
radeon_router_select_ddc_port(radeon_connector);
ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
if (use_aux) {
struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
ret = i2c_transfer(&dig->dp_i2c_bus->adapter, msgs, 2);
} else {
ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
}
if (ret != 2)
/* Couldn't find an accessible DDC on this connector */
return false;