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>

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,