drm/radeon/kms/DCE3+: switch pads to ddc mode when going i2c

[pandora-kernel.git] / drivers / gpu / drm / radeon / radeon_i2c.c

diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c
index bfd2ce5..0416804 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_i2c.c
+++ b/drivers/gpu/drm/radeon/radeon_i2c.c
@@ -99,6 +99,13 @@ static void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
                }
        }
 
+       /* switch the pads to ddc mode */
+       if (ASIC_IS_DCE3(rdev) && rec->hw_capable) {
+               temp = RREG32(rec->mask_clk_reg);
+               temp &= ~(1 << 16);
+               WREG32(rec->mask_clk_reg, temp);
+       }
+
        /* clear the output pin values */
        temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
        WREG32(rec->a_clk_reg, temp);