diff options
| author | Alex Deucher <alexdeucher@gmail.com> | 2009-11-10 21:59:44 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2009-12-02 02:36:39 +0100 |
| commit | 9b9fe72488a3a637e0550cc888e3f7a8f70e521e (patch) | |
| tree | 5739a07ba9a57c58174f79a065e547e92aafe3df /drivers/gpu/drm/radeon/radeon_i2c.c | |
| parent | drm/radeon/kms: dont't pass a radeon_connector to radeon_i2c_do_lock() (diff) | |
| download | linux-9b9fe72488a3a637e0550cc888e3f7a8f70e521e.tar.xz linux-9b9fe72488a3a637e0550cc888e3f7a8f70e521e.zip | |
drm/radeon/kms: clean up i2c
- Change reg/mask names to match what we use internally
and in the bios
- Clarify how i2c over gpio on radeon actually works
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_i2c.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_i2c.c | 43 |
1 files changed, 24 insertions, 19 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c index d8296acb082f..e97a3912d99f 100644 --- a/drivers/gpu/drm/radeon/radeon_i2c.c +++ b/drivers/gpu/drm/radeon/radeon_i2c.c @@ -78,16 +78,16 @@ void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state) R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3))); } } - if (lock_state) { - temp = RREG32(rec->a_clk_reg); - temp &= ~(rec->a_clk_mask); - WREG32(rec->a_clk_reg, temp); - - temp = RREG32(rec->a_data_reg); - temp &= ~(rec->a_data_mask); - WREG32(rec->a_data_reg, temp); - } + /* clear the output pin values */ + temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask; + WREG32(rec->a_clk_reg, temp); + + temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask; + WREG32(rec->a_data_reg, temp); + + + /* mask the gpio pins for software use */ temp = RREG32(rec->mask_clk_reg); if (lock_state) temp |= rec->mask_clk_mask; @@ -112,8 +112,9 @@ static int get_clock(void *i2c_priv) struct radeon_i2c_bus_rec *rec = &i2c->rec; uint32_t val; - val = RREG32(rec->get_clk_reg); - val &= rec->get_clk_mask; + /* read the value off the pin */ + val = RREG32(rec->y_clk_reg); + val &= rec->y_clk_mask; return (val != 0); } @@ -126,8 +127,10 @@ static int get_data(void *i2c_priv) struct radeon_i2c_bus_rec *rec = &i2c->rec; uint32_t val; - val = RREG32(rec->get_data_reg); - val &= rec->get_data_mask; + /* read the value off the pin */ + val = RREG32(rec->y_data_reg); + val &= rec->y_data_mask; + return (val != 0); } @@ -138,9 +141,10 @@ static void set_clock(void *i2c_priv, int clock) struct radeon_i2c_bus_rec *rec = &i2c->rec; uint32_t val; - val = RREG32(rec->put_clk_reg) & (uint32_t)~(rec->put_clk_mask); - val |= clock ? 0 : rec->put_clk_mask; - WREG32(rec->put_clk_reg, val); + /* set pin direction */ + val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask; + val |= clock ? 0 : rec->en_clk_mask; + WREG32(rec->en_clk_reg, val); } static void set_data(void *i2c_priv, int data) @@ -150,9 +154,10 @@ static void set_data(void *i2c_priv, int data) struct radeon_i2c_bus_rec *rec = &i2c->rec; uint32_t val; - val = RREG32(rec->put_data_reg) & (uint32_t)~(rec->put_data_mask); - val |= data ? 0 : rec->put_data_mask; - WREG32(rec->put_data_reg, val); + /* set pin direction */ + val = RREG32(rec->en_data_reg) & ~rec->en_data_mask; + val |= data ? 0 : rec->en_data_mask; + WREG32(rec->en_data_reg, val); } struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev, |