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From e4f2c3641ccae2cb1614c8fda5ce307170b20921 Mon Sep 17 00:00:00 2001
From: Sergio Aguirre <saaguirre@ti.com>
Date: Thu, 24 Jun 2010 18:21:52 -0500
Subject: [PATCH 23/75] omap3beagle: camera: Fix powerup sequence
The powerup sequence was very incomplete. After revisiting the
Aptina developer's guide, the resulting powerup sequence is followed.
Signed-off-by: Sergio Aguirre <saaguirre@ti.com>
---
arch/arm/mach-omap2/board-omap3beagle-camera.c | 49 ++++++++++++++++++++++--
1 files changed, 45 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-omap2/board-omap3beagle-camera.c b/arch/arm/mach-omap2/board-omap3beagle-camera.c
index 6babaf3..792c48d 100644
--- a/arch/arm/mach-omap2/board-omap3beagle-camera.c
+++ b/arch/arm/mach-omap2/board-omap3beagle-camera.c
@@ -51,6 +51,8 @@
#define ISP_MT9T111_MCLK 216000000
+#define LEOPARD_RESET_GPIO 98
+
static struct regulator *beagle_mt9t111_1_8v;
static struct regulator *beagle_mt9t111_2_8v;
@@ -174,16 +176,42 @@ static int mt9t111_power_set(struct v4l2_int_device *s, enum v4l2_power power)
break;
case V4L2_POWER_ON:
- isp_set_xclk(vdev->cam->isp, MT9T111_CLK_MIN, CAM_USE_XCLKA);
-
#if defined(CONFIG_VIDEO_OMAP3) || defined(CONFIG_VIDEO_OMAP3_MODULE)
isp_configure_interface(vdev->cam->isp, &mt9t111_if_config);
#endif
- /* turn on analog power */
+ /* Set RESET_BAR to 0 */
+ gpio_set_value(LEOPARD_RESET_GPIO, 0);
+
+ /* turn on VDD */
regulator_enable(beagle_mt9t111_1_8v);
+
+ mdelay(1);
+
+ /* turn on VDD_IO */
regulator_enable(beagle_mt9t111_2_8v);
- udelay(100);
+
+ mdelay(50);
+
+ /* Enable EXTCLK */
+ isp_set_xclk(vdev->cam->isp, MT9T111_CLK_MIN, CAM_USE_XCLKA);
+
+ /*
+ * Wait at least 70 CLK cycles (w/EXTCLK = 6MHz, or CLK_MIN):
+ * ((1000000 * 70) / 6000000) = aprox 12 us.
+ */
+
+ udelay(12);
+
+ /* Set RESET_BAR to 1 */
+ gpio_set_value(LEOPARD_RESET_GPIO, 1);
+
+ /*
+ * Wait at least 100 CLK cycles (w/EXTCLK = 6MHz, or CLK_MIN):
+ * ((1000000 * 100) / 6000000) = aprox 17 us.
+ */
+
+ udelay(17);
break;
@@ -224,6 +252,17 @@ static int beagle_cam_probe(struct platform_device *pdev)
return PTR_ERR(beagle_mt9t111_2_8v);
}
+ if (gpio_request(LEOPARD_RESET_GPIO, "cam_rst") != 0) {
+ dev_err(&pdev->dev, "Could not request GPIO %d",
+ LEOPARD_RESET_GPIO);
+ regulator_put(beagle_mt9t111_2_8v);
+ regulator_put(beagle_mt9t111_1_8v);
+ return -ENODEV;
+ }
+
+ /* set to output mode, default value 0 */
+ gpio_direction_output(LEOPARD_RESET_GPIO, 0);
+
printk(KERN_INFO MODULE_NAME ": Driver registration complete \n");
return 0;
@@ -238,6 +277,8 @@ static int beagle_cam_remove(struct platform_device *pdev)
regulator_disable(beagle_mt9t111_2_8v);
regulator_put(beagle_mt9t111_2_8v);
+ gpio_free(LEOPARD_RESET_GPIO);
+
return 0;
}
--
1.6.6.1
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