On 2019-07-07 20:18, Laurent Pinchart wrote:
> If an enable GPIO is declared in the firmware, assert it when enabling
> the bridge and deassert it when disabling it.
>
> Signed-off-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
This also comes in handy for the ADV7123, which has a power save pin.
Looks good to me.
Reviewed-by: Stefan Agner <ste...@agner.ch>
--
Stefan
> ---
> drivers/gpu/drm/bridge/simple-bridge.c | 22 ++++++++++++++++++----
> 1 file changed, 18 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/simple-bridge.c
> b/drivers/gpu/drm/bridge/simple-bridge.c
> index bff240cf283d..a7edf3c39627 100644
> --- a/drivers/gpu/drm/bridge/simple-bridge.c
> +++ b/drivers/gpu/drm/bridge/simple-bridge.c
> @@ -6,6 +6,7 @@
> * Maxime Ripard <maxime.rip...@free-electrons.com>
> */
>
> +#include <linux/gpio/consumer.h>
> #include <linux/module.h>
> #include <linux/of_device.h>
> #include <linux/of_graph.h>
> @@ -29,6 +30,7 @@ struct simple_bridge {
>
> struct i2c_adapter *ddc;
> struct regulator *vdd;
> + struct gpio_desc *enable;
> };
>
> static inline struct simple_bridge *
> @@ -135,19 +137,23 @@ static int simple_bridge_attach(struct drm_bridge
> *bridge)
> static void simple_bridge_enable(struct drm_bridge *bridge)
> {
> struct simple_bridge *sbridge = drm_bridge_to_simple_bridge(bridge);
> - int ret = 0;
> + int ret;
>
> - if (sbridge->vdd)
> + if (sbridge->vdd) {
> ret = regulator_enable(sbridge->vdd);
> + if (ret)
> + DRM_ERROR("Failed to enable vdd regulator: %d\n", ret);
> + }
>
> - if (ret)
> - DRM_ERROR("Failed to enable vdd regulator: %d\n", ret);
> + gpiod_set_value_cansleep(sbridge->enable, 1);
> }
>
> static void simple_bridge_disable(struct drm_bridge *bridge)
> {
> struct simple_bridge *sbridge = drm_bridge_to_simple_bridge(bridge);
>
> + gpiod_set_value_cansleep(sbridge->enable, 0);
> +
> if (sbridge->vdd)
> regulator_disable(sbridge->vdd);
> }
> @@ -200,6 +206,14 @@ static int simple_bridge_probe(struct
> platform_device *pdev)
> dev_dbg(&pdev->dev, "No vdd regulator found: %d\n", ret);
> }
>
> + sbridge->enable = devm_gpiod_get_optional(&pdev->dev, "enable",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(sbridge->enable)) {
> + if (PTR_ERR(sbridge->enable) != -EPROBE_DEFER)
> + dev_err(&pdev->dev, "Unable to retrieve enable GPIO\n");
> + return PTR_ERR(sbridge->enable);
> + }
> +
> sbridge->ddc = simple_bridge_retrieve_ddc(&pdev->dev);
> if (IS_ERR(sbridge->ddc)) {
> if (PTR_ERR(sbridge->ddc) == -ENODEV) {
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