On Tue, 20 Aug 2019 04:16:40 +0300 Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> 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.pinchart@xxxxxxxxxxxxxxxx> > Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx> > Reviewed-by: Stefan Agner <stefan@xxxxxxxx> Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> > --- > 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 85aa852eafb4..3e5031833368 100644 > --- a/drivers/gpu/drm/bridge/simple-bridge.c > +++ b/drivers/gpu/drm/bridge/simple-bridge.c > @@ -6,6 +6,7 @@ > * Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> > */ > > +#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 * > @@ -140,19 +142,23 @@ 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); > } > @@ -205,6 +211,14 @@ 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) { _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel