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drm/radeon/kms/dce3+: add support for hw i2c using atom

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Starting with DCE3 hardware, atom contains a general purpose
ProcessI2cChannelTransaction similar to ProcessAuxChannelTransaction.

Add an implementation using the atom tables for DCE3+ hardware.

This should be a little less CPU intensive than bit banging and
may work better in certain cases.

Enable it by setting the radeon hw_i2c module parameter to 1.  E.g.,
radeon.hw_i2c=1
on the kernel command line in grub.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2012-01-20 14:50:18 -05:00 • committed by Dave Airlie
parent 9048955748
commit 30388c6e48
3 changed files with 161 additions and 1 deletions
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21
drivers/gpu/drm/radeon/radeon_i2c.c
View file

@ -30,6 +30,10 @@
#include "radeon.h"
#include "atom.h"
extern int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg *msgs, int num);
extern u32 radeon_atom_hw_i2c_func(struct i2c_adapter *adap);
/**
* radeon_ddc_probe
*
@ -882,6 +886,11 @@ static const struct i2c_algorithm radeon_i2c_algo = {
.functionality = radeon_hw_i2c_func,
};
static const struct i2c_algorithm radeon_atom_i2c_algo = {
.master_xfer = radeon_atom_hw_i2c_xfer,
.functionality = radeon_atom_hw_i2c_func,
};
struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
struct radeon_i2c_bus_rec *rec,
const char *name)
@ -914,6 +923,18 @@ struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
DRM_ERROR("Failed to register hw i2c %s\n", name);
goto out_free;
}
} else if (rec->hw_capable &&
radeon_hw_i2c &&
ASIC_IS_DCE3(rdev)) {
/* hw i2c using atom */
snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
"Radeon i2c hw bus %s", name);
i2c->adapter.algo = &radeon_atom_i2c_algo;
ret = i2c_add_adapter(&i2c->adapter);
if (ret) {
DRM_ERROR("Failed to register hw i2c %s\n", name);
goto out_free;
}
} else {
/* set the radeon bit adapter */
snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),