When binding the TCON, we were checking the reset control status and asserting reset if it wasn't in reset. The check failed to account for the reset control API returning error codes if the status callback was not implemented.

Since we want the TCON to be reset in all cases, use reset_control_reset to force a reset instead.

Fixes: 9026e0d122ac ("drm: Add Allwinner A10 Display Engine support") Signed-off-by: Chen-Yu Tsai wens@csie.org ---

Changes since v1:

- Replaced reset_control_assert / reset_control_deassert sequence with reset_control_reset, which conveys our intent more clearly

--- drivers/gpu/drm/sun4i/sun4i_tcon.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index d9791292553e..36cf1a0acc65 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -530,10 +530,7 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master, }

/* Make sure our TCON is reset */ - if (!reset_control_status(tcon->lcd_rst)) - reset_control_assert(tcon->lcd_rst); - - ret = reset_control_deassert(tcon->lcd_rst); + ret = reset_control_reset(tcon->lcd_rst); if (ret) { dev_err(dev, "Couldn't deassert our reset line\n"); return ret;