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Subject[PATCH 4/4] drm: bridge: anx7688: Support bypass GPIO feature
Date
Support optional feature: bypass GPIO.

Get GPIO status in irq handler. If GPIO is active, mode_fixup would be
bypassed.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
drivers/gpu/drm/bridge/analogix-anx7688.c | 57 +++++++++++++++++++++++
1 file changed, 57 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix-anx7688.c b/drivers/gpu/drm/bridge/analogix-anx7688.c
index 5a3a2251c1c5..1d09db2cf8e9 100644
--- a/drivers/gpu/drm/bridge/analogix-anx7688.c
+++ b/drivers/gpu/drm/bridge/analogix-anx7688.c
@@ -5,11 +5,16 @@
* Copyright 2016 Google LLC
*/

+#include <linux/gpio.h>
#include <linux/i2c.h>
+#include <linux/interrupt.h>
#include <linux/module.h>
+#include <linux/of_gpio.h>
#include <linux/regmap.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_probe_helper.h>

/* Register addresses */
#define VENDOR_ID_REG 0x00
@@ -31,6 +36,9 @@ struct anx7688 {
struct i2c_client *client;
struct regmap *regmap;

+ struct gpio_desc *gpiod_bypass;
+ int bypass;
+
bool filter;
};

@@ -49,6 +57,10 @@ static bool anx7688_bridge_mode_fixup(struct drm_bridge *bridge,
int totalbw, requiredbw;
int ret;

+ /* bypass anx mode fixup */
+ if (anx7688->bypass)
+ return true;
+
if (!anx7688->filter)
return true;

@@ -93,6 +105,19 @@ static const struct drm_bridge_funcs anx7688_bridge_funcs = {
.mode_fixup = anx7688_bridge_mode_fixup,
};

+static irqreturn_t gpio_display_mux_det_threaded_handler(int unused, void *data)
+{
+ struct anx7688 *anx7688 = data;
+
+ anx7688->bypass = gpiod_get_value(anx7688->gpiod_bypass);
+ dev_dbg(&anx7688->client->dev, "Interrupt %d!\n", anx7688->bypass);
+
+ if (anx7688->bridge.dev)
+ drm_kms_helper_hotplug_event(anx7688->bridge.dev);
+
+ return IRQ_HANDLED;
+}
+
static const struct regmap_config anx7688_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
@@ -156,6 +181,38 @@ static int anx7688_i2c_probe(struct i2c_client *client,
buffer[0], buffer[1]);
}

+ /* Optional bypass-gpios */
+ anx7688->gpiod_bypass = devm_gpiod_get_optional(dev, "bypass",
+ GPIOD_IN);
+ if (IS_ERR(anx7688->gpiod_bypass)) {
+ ret = PTR_ERR(anx7688->gpiod_bypass);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "bypass-gpios assigned failed\n");
+ return ret;
+ }
+ if (anx7688->gpiod_bypass) {
+ int irq;
+
+ irq = gpiod_to_irq(anx7688->gpiod_bypass);
+ if (irq < 0) {
+ dev_err(dev, "Failed to get output irq %d\n", irq);
+ return -ENODEV;
+ }
+
+ anx7688->bypass = gpiod_get_value(anx7688->gpiod_bypass);
+
+ ret = devm_request_threaded_irq(dev, irq, NULL,
+ gpio_display_mux_det_threaded_handler,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT,
+ "gpio-display-mux-det", anx7688);
+ if (ret) {
+ dev_err(dev,
+ "Failed to request MUX_DET threaded irq\n");
+ return ret;
+ }
+ }
+
anx7688->bridge.funcs = &anx7688_bridge_funcs;
drm_bridge_add(&anx7688->bridge);

--
2.24.0.393.g34dc348eaf-goog
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