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path: root/drivers/gpu/drm/radeon/radeon_i2c.c
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Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_i2c.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_i2c.c32
1 files changed, 26 insertions, 6 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c
index 98a8ad680109..85bcfc8923a7 100644
--- a/drivers/gpu/drm/radeon/radeon_i2c.c
+++ b/drivers/gpu/drm/radeon/radeon_i2c.c
@@ -26,10 +26,15 @@
#include <linux/export.h>
#include "drmP.h"
+#include "drm_edid.h"
#include "radeon_drm.h"
#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
*
@@ -41,13 +46,13 @@ bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
int ret;
struct i2c_msg msgs[] = {
{
- .addr = 0x50,
+ .addr = DDC_ADDR,
.flags = 0,
.len = 1,
.buf = &out,
},
{
- .addr = 0x50,
+ .addr = DDC_ADDR,
.flags = I2C_M_RD,
.len = 8,
.buf = buf,
@@ -882,6 +887,11 @@ 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 +924,18 @@ 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),
@@ -925,10 +947,8 @@ struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
i2c->algo.bit.setscl = set_clock;
i2c->algo.bit.getsda = get_data;
i2c->algo.bit.getscl = get_clock;
- i2c->algo.bit.udelay = 20;
- /* 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.udelay = 10;
+ i2c->algo.bit.timeout = usecs_to_jiffies(2200); /* from VESA */
i2c->algo.bit.data = i2c;
ret = i2c_bit_add_bus(&i2c->adapter);
if (ret) {