On Tue, 20 Aug 2019 04:16:40 +0300 Laurent Pinchart laurent.pinchart@ideasonboard.com 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@ideasonboard.com Reviewed-by: Andrzej Hajda a.hajda@samsung.com Reviewed-by: Stefan Agner stefan@agner.ch
Reviewed-by: Boris Brezillon boris.brezillon@collabora.com
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@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 * @@ -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) {