mirror of
https://git.yoctoproject.org/meta-ti
synced 2026-07-26 22:07:51 +00:00
Koen Kooi
104 lines
2.8 KiB
Diff
104 lines
2.8 KiB
Diff
From e4f2c3641ccae2cb1614c8fda5ce307170b20921 Mon Sep 17 00:00:00 2001
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From: Sergio Aguirre <saaguirre@ti.com>
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Date: Thu, 24 Jun 2010 18:21:52 -0500
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Subject: [PATCH 23/75] omap3beagle: camera: Fix powerup sequence
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The powerup sequence was very incomplete. After revisiting the
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Aptina developer's guide, the resulting powerup sequence is followed.
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Signed-off-by: Sergio Aguirre <saaguirre@ti.com>
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---
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arch/arm/mach-omap2/board-omap3beagle-camera.c | 49 ++++++++++++++++++++++--
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1 files changed, 45 insertions(+), 4 deletions(-)
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diff --git a/arch/arm/mach-omap2/board-omap3beagle-camera.c b/arch/arm/mach-omap2/board-omap3beagle-camera.c
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index 6babaf3..792c48d 100644
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--- a/arch/arm/mach-omap2/board-omap3beagle-camera.c
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+++ b/arch/arm/mach-omap2/board-omap3beagle-camera.c
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@@ -51,6 +51,8 @@
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#define ISP_MT9T111_MCLK 216000000
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+#define LEOPARD_RESET_GPIO 98
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+
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static struct regulator *beagle_mt9t111_1_8v;
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static struct regulator *beagle_mt9t111_2_8v;
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@@ -174,16 +176,42 @@ static int mt9t111_power_set(struct v4l2_int_device *s, enum v4l2_power power)
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break;
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case V4L2_POWER_ON:
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- isp_set_xclk(vdev->cam->isp, MT9T111_CLK_MIN, CAM_USE_XCLKA);
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-
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#if defined(CONFIG_VIDEO_OMAP3) || defined(CONFIG_VIDEO_OMAP3_MODULE)
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isp_configure_interface(vdev->cam->isp, &mt9t111_if_config);
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#endif
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- /* turn on analog power */
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+ /* Set RESET_BAR to 0 */
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+ gpio_set_value(LEOPARD_RESET_GPIO, 0);
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+
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+ /* turn on VDD */
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regulator_enable(beagle_mt9t111_1_8v);
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+
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+ mdelay(1);
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+
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+ /* turn on VDD_IO */
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regulator_enable(beagle_mt9t111_2_8v);
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- udelay(100);
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+
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+ mdelay(50);
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+
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+ /* Enable EXTCLK */
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+ isp_set_xclk(vdev->cam->isp, MT9T111_CLK_MIN, CAM_USE_XCLKA);
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+
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+ /*
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+ * Wait at least 70 CLK cycles (w/EXTCLK = 6MHz, or CLK_MIN):
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+ * ((1000000 * 70) / 6000000) = aprox 12 us.
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+ */
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+
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+ udelay(12);
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+
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+ /* Set RESET_BAR to 1 */
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+ gpio_set_value(LEOPARD_RESET_GPIO, 1);
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+
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+ /*
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+ * Wait at least 100 CLK cycles (w/EXTCLK = 6MHz, or CLK_MIN):
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+ * ((1000000 * 100) / 6000000) = aprox 17 us.
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+ */
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+
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+ udelay(17);
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break;
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@@ -224,6 +252,17 @@ static int beagle_cam_probe(struct platform_device *pdev)
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return PTR_ERR(beagle_mt9t111_2_8v);
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}
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+ if (gpio_request(LEOPARD_RESET_GPIO, "cam_rst") != 0) {
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+ dev_err(&pdev->dev, "Could not request GPIO %d",
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+ LEOPARD_RESET_GPIO);
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+ regulator_put(beagle_mt9t111_2_8v);
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+ regulator_put(beagle_mt9t111_1_8v);
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+ return -ENODEV;
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+ }
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+
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+ /* set to output mode, default value 0 */
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+ gpio_direction_output(LEOPARD_RESET_GPIO, 0);
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+
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printk(KERN_INFO MODULE_NAME ": Driver registration complete \n");
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return 0;
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@@ -238,6 +277,8 @@ static int beagle_cam_remove(struct platform_device *pdev)
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regulator_disable(beagle_mt9t111_2_8v);
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regulator_put(beagle_mt9t111_2_8v);
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+ gpio_free(LEOPARD_RESET_GPIO);
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+
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return 0;
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}
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--
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1.6.6.1
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