From: Liu Ying <Ying.Liu@freescale.com>
Date: Thu, 5 Jul 2012 10:42:02 +0000 (+0800)
Subject: ENGR00215884-1 MX6 SabreSD:Refine OV mipi camera reset sequence
X-Git-Tag: v3.0.35-fsl~793
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=21e706fd84c8bacb01962bbd0e5e0068176f26b4;p=karo-tx-linux.git

ENGR00215884-1 MX6 SabreSD:Refine OV mipi camera reset sequence

This patch refines OV mipi camera reset sequence according to
OV's recommendation:
reset --------------------|_____|----------------
                        ->| 1ms |<-
pwdn  ----------|_________________________|------
              ->|   5ms   |<- ->|   5ms   |<-
    ->|   5ms   |<-

This change makes the OV mipi camera be at a correct status
after reset, otherwise, the wrong status of OV mipi camera
will reduce the ~2.78V analog camera power to ~2.3V, which
causes random thin colorful lines on OV5642 CSI camera image
as OV5642 CSI camera uses the same analog power.

Signed-off-by: Liu Ying <Ying.Liu@freescale.com>
(cherry picked from commit 9e78895d8856651b769908e63d4ebc514314eeaa)
---

diff --git a/arch/arm/mach-mx6/board-mx6q_sabresd.c b/arch/arm/mach-mx6/board-mx6q_sabresd.c
index 2089e2bd3fef..07d76cecfa82 100644
--- a/arch/arm/mach-mx6/board-mx6q_sabresd.c
+++ b/arch/arm/mach-mx6/board-mx6q_sabresd.c
@@ -554,8 +554,14 @@ static void mx6q_mipi_sensor_io_init(void)
 	/* Camera power down */
 	gpio_request(SABRESD_MIPICSI_PWN, "cam-pwdn");
 	gpio_direction_output(SABRESD_MIPICSI_PWN, 1);
-	msleep(1);
+	msleep(5);
 	gpio_set_value(SABRESD_MIPICSI_PWN, 0);
+	msleep(5);
+	gpio_set_value(SABRESD_MIPICSI_RST, 0);
+	msleep(1);
+	gpio_set_value(SABRESD_MIPICSI_RST, 1);
+	msleep(5);
+	gpio_set_value(SABRESD_MIPICSI_PWN, 1);
 
 	/*for mx6dl, mipi virtual channel 1 connect to csi 1*/
 	if (cpu_is_mx6dl())