diff options
Diffstat (limited to 'target/linux/s3c24xx/patches-2.6.24/1006-fix-i2c-s3c2410-resume-race.patch.patch')
-rw-r--r-- | target/linux/s3c24xx/patches-2.6.24/1006-fix-i2c-s3c2410-resume-race.patch.patch | 115 |
1 files changed, 0 insertions, 115 deletions
diff --git a/target/linux/s3c24xx/patches-2.6.24/1006-fix-i2c-s3c2410-resume-race.patch.patch b/target/linux/s3c24xx/patches-2.6.24/1006-fix-i2c-s3c2410-resume-race.patch.patch deleted file mode 100644 index 720608e..0000000 --- a/target/linux/s3c24xx/patches-2.6.24/1006-fix-i2c-s3c2410-resume-race.patch.patch +++ /dev/null @@ -1,115 +0,0 @@ -From d3063c1ec65b37b45e808313133196185ea4901f Mon Sep 17 00:00:00 2001 -From: mokopatches <mokopatches@openmoko.org> -Date: Fri, 4 Apr 2008 11:30:03 +0100 -Subject: [PATCH] fix-i2c-s3c2410-resume-race.patch - fix-i2c-s3c2410-resume-race.patch - -There is a nasty race between i2c-s3c2410 resume and resume of I2C -driver and the client drivers -- the watchdog device actually gets to -use the dead I2C bus before it is reinitialized by the I2C driver -resume! This patch makes sure any customers get turned away until -the shopkeeper has woken up. - -Signed-off-by: Andy Green <andy@openmoko.com> ---- - drivers/i2c/busses/i2c-s3c2410.c | 35 ++++++++++++++++++++++++++++++++++- - 1 files changed, 34 insertions(+), 1 deletions(-) - -diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c -index c44ada5..5ac8309 100644 ---- a/drivers/i2c/busses/i2c-s3c2410.c -+++ b/drivers/i2c/busses/i2c-s3c2410.c -@@ -71,6 +71,8 @@ struct s3c24xx_i2c { - struct resource *irq; - struct resource *ioarea; - struct i2c_adapter adap; -+ -+ int suspended; - }; - - /* default platform data to use if not supplied in the platform_device -@@ -156,6 +158,14 @@ static inline void s3c24xx_i2c_disable_irq(struct s3c24xx_i2c *i2c) - unsigned long tmp; - - tmp = readl(i2c->regs + S3C2410_IICCON); -+ -+/* S3c2442 datasheet -+ * -+ * If the IICCON[5]=0, IICCON[4] does not operate correctly. -+ * So, It is recommended that you should set IICCON[5]=1, -+ * although you does not use the IIC interrupt. -+ */ -+ - writel(tmp & ~S3C2410_IICCON_IRQEN, i2c->regs + S3C2410_IICCON); - } - -@@ -282,7 +292,7 @@ static int i2s_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat) - - case STATE_STOP: - dev_err(i2c->dev, "%s: called in STATE_STOP\n", __FUNCTION__); -- s3c24xx_i2c_disable_irq(i2c); -+ s3c24xx_i2c_disable_irq(i2c); - goto out_ack; - - case STATE_START: -@@ -502,6 +512,14 @@ static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, struct i2c_msg *msgs, int - unsigned long timeout; - int ret; - -+ if (i2c->suspended) { -+ dev_err(i2c->dev, -+ "Hey I am still asleep (suspended: %d), retry later\n", -+ i2c->suspended); -+ ret = -EAGAIN; -+ goto out; -+ } -+ - ret = s3c24xx_i2c_set_master(i2c); - if (ret != 0) { - dev_err(i2c->dev, "cannot get bus (error %d)\n", ret); -@@ -886,6 +904,17 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev) - } - - #ifdef CONFIG_PM -+ -+static int s3c24xx_i2c_suspend(struct platform_device *dev, pm_message_t state) -+{ -+ struct s3c24xx_i2c *i2c = platform_get_drvdata(dev); -+ -+ if (i2c != NULL) -+ i2c->suspended++; -+ -+ return 0; -+} -+ - static int s3c24xx_i2c_resume(struct platform_device *dev) - { - struct s3c24xx_i2c *i2c = platform_get_drvdata(dev); -@@ -893,6 +922,8 @@ static int s3c24xx_i2c_resume(struct platform_device *dev) - if (i2c != NULL) - s3c24xx_i2c_init(i2c); - -+ i2c->suspended--; -+ - return 0; - } - -@@ -905,6 +936,7 @@ static int s3c24xx_i2c_resume(struct platform_device *dev) - static struct platform_driver s3c2410_i2c_driver = { - .probe = s3c24xx_i2c_probe, - .remove = s3c24xx_i2c_remove, -+ .suspend = s3c24xx_i2c_suspend, - .resume = s3c24xx_i2c_resume, - .driver = { - .owner = THIS_MODULE, -@@ -915,6 +947,7 @@ static struct platform_driver s3c2410_i2c_driver = { - static struct platform_driver s3c2440_i2c_driver = { - .probe = s3c24xx_i2c_probe, - .remove = s3c24xx_i2c_remove, -+ .suspend = s3c24xx_i2c_suspend, - .resume = s3c24xx_i2c_resume, - .driver = { - .owner = THIS_MODULE, --- -1.5.6.5 - |