drm/radeon/kms: Simplify I2C post_xfer function

There is no point in re-doing in post_xfer all the initialization
that was already done by pre_xfer. Instead, only do the work which
differs from pre_xfer.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c
index 6c111c1..02cb7da 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_i2c.c
+++ b/drivers/gpu/drm/radeon/radeon_i2c.c
@@ -81,8 +81,9 @@ bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool requires_e
 
 /* bit banging i2c */
 
-static void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
+static int pre_xfer(struct i2c_adapter *i2c_adap)
 {
+       struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
        struct radeon_device *rdev = i2c->dev->dev_private;
        struct radeon_i2c_bus_rec *rec = &i2c->rec;
        uint32_t temp;
@@ -137,19 +138,30 @@ static void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
        WREG32(rec->en_data_reg, temp);
 
        /* mask the gpio pins for software use */
-       temp = RREG32(rec->mask_clk_reg);
-       if (lock_state)
-               temp |= rec->mask_clk_mask;
-       else
-               temp &= ~rec->mask_clk_mask;
+       temp = RREG32(rec->mask_clk_reg) | rec->mask_clk_mask;
        WREG32(rec->mask_clk_reg, temp);
        temp = RREG32(rec->mask_clk_reg);
 
+       temp = RREG32(rec->mask_data_reg) | rec->mask_data_mask;
+       WREG32(rec->mask_data_reg, temp);
        temp = RREG32(rec->mask_data_reg);
-       if (lock_state)
-               temp |= rec->mask_data_mask;
-       else
-               temp &= ~rec->mask_data_mask;
+
+       return 0;
+}
+
+static void post_xfer(struct i2c_adapter *i2c_adap)
+{
+       struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
+       struct radeon_device *rdev = i2c->dev->dev_private;
+       struct radeon_i2c_bus_rec *rec = &i2c->rec;
+       uint32_t temp;
+
+       /* unmask the gpio pins for software use */
+       temp = RREG32(rec->mask_clk_reg) & ~rec->mask_clk_mask;
+       WREG32(rec->mask_clk_reg, temp);
+       temp = RREG32(rec->mask_clk_reg);
+
+       temp = RREG32(rec->mask_data_reg) & ~rec->mask_data_mask;
        WREG32(rec->mask_data_reg, temp);
        temp = RREG32(rec->mask_data_reg);
 }
@@ -209,22 +221,6 @@ static void set_data(void *i2c_priv, int data)
        WREG32(rec->en_data_reg, val);
 }
 
-static int pre_xfer(struct i2c_adapter *i2c_adap)
-{
-       struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
-
-       radeon_i2c_do_lock(i2c, 1);
-
-       return 0;
-}
-
-static void post_xfer(struct i2c_adapter *i2c_adap)
-{
-       struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
-
-       radeon_i2c_do_lock(i2c, 0);
-}
-
 /* hw i2c */
 
 static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)