Commit 5786e2c5 authored by Alex Deucher's avatar Alex Deucher Committed by Dave Airlie

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

The pins for ddc and aux are shared so you need to switch the
mode when doing ddc.  The ProcessAuxChannel table already sets
the pin mode to DP.  This should fix unreliable ddc issues
on DP ports using non-DP monitors.
Signed-off-by: default avatarAlex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 4e186b2d
......@@ -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);
......
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