drm/bridge: it6505: Fix inverted reset polarity

The IT6505 bridge chip has a active low reset line. Since it is a
"reset" and not an "enable" line, the GPIO should be asserted to
put it in reset and deasserted to bring it out of reset during
the power on sequence.

The polarity was inverted when the driver was first introduced, likely
because the device family that was targeted had an inverting level
shifter on the reset line.

The MT8186 Corsola devices already have the IT6505 in their device tree,
but the whole display pipeline is actually disabled and won't be enabled
until some remaining issues are sorted out. The other known user is
the MT8183 Kukui / Jacuzzi family; their device trees currently do not
have the IT6505 included.

Fix the polarity in the driver while there are no actual users.

Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
Cc: stable@vger.kernel.org
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241029095411.657616-1-wenst@chromium.org
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 7ff17aa14b01e4d9f626424e065131ae2b195c62..008d86cc562af77952d65beacc3979b8611ea6cc 100644 (file)
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -2614,9 +2614,9 @@ static int it6505_poweron(struct it6505 *it6505)
        /* time interval between OVDD and SYSRSTN at least be 10ms */
        if (pdata->gpiod_reset) {
                usleep_range(10000, 20000);
-               gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
-               usleep_range(1000, 2000);
                gpiod_set_value_cansleep(pdata->gpiod_reset, 1);
+               usleep_range(1000, 2000);
+               gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
                usleep_range(25000, 35000);
        }
 
@@ -2647,7 +2647,7 @@ static int it6505_poweroff(struct it6505 *it6505)
        disable_irq_nosync(it6505->irq);
 
        if (pdata->gpiod_reset)
-               gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
+               gpiod_set_value_cansleep(pdata->gpiod_reset, 1);
 
        if (pdata->pwr18) {
                err = regulator_disable(pdata->pwr18);
@@ -3135,7 +3135,7 @@ static int it6505_init_pdata(struct it6505 *it6505)
                return PTR_ERR(pdata->ovdd);
        }
 
-       pdata->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+       pdata->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
        if (IS_ERR(pdata->gpiod_reset)) {
                dev_err(dev, "gpiod_reset gpio not found");
                return PTR_ERR(pdata->gpiod_reset);