From ba7b52c20993e7c1ef7b79fb10af807df82048ca Mon Sep 17 00:00:00 2001 From: Klaus Pedersen Date: Fri, 18 Jan 2008 19:30:23 +0200 Subject: [PATCH] T2: Remove redundant clear and restore of the COR flag The T2 Clear-On-Read (COR) feature works by clearing all pending irqs when the ISR register is read. It should be needless to say that this feature isn't compatible with shared interrupts, unless the value of the ISR is read only once for each interrupt. It is therefor safe to assume that COR is not used - because if a driver uses the feature, that driver will clear the interrupts belonging to other drivers. This patch removes the redundant clearing and restoring of the COR bit in REG_PWR_SIH_CTRL. Signed-off-by: Klaus Pedersen Signed-off-by: Tony Lindgren --- drivers/i2c/chips/twl4030_usb.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/drivers/i2c/chips/twl4030_usb.c b/drivers/i2c/chips/twl4030_usb.c index 52bb071cfd2..b3365f69088 100644 --- a/drivers/i2c/chips/twl4030_usb.c +++ b/drivers/i2c/chips/twl4030_usb.c @@ -480,12 +480,6 @@ static irqreturn_t twl4030_usb_irq(int irq, void *_twl) { int ret = IRQ_NONE; u8 val; - u8 sih_ctrl; - - /* save previous value of SIH_CTRL and disable clear_on_read */ - twl4030_i2c_read_u8(TWL4030_MODULE_INT, &sih_ctrl, REG_PWR_SIH_CTRL); - twl4030_i2c_write_u8(TWL4030_MODULE_INT, (sih_ctrl & ~COR), - REG_PWR_SIH_CTRL); if (twl4030_i2c_read_u8(TWL4030_MODULE_INT, &val, REG_PWR_ISR1) < 0) { printk(KERN_ERR "twl4030_usb: i2c read failed," @@ -515,8 +509,6 @@ static irqreturn_t twl4030_usb_irq(int irq, void *_twl) ret = IRQ_HANDLED; done: - /* restore previous value of SIH_CTRL */ - twl4030_i2c_write_u8(TWL4030_MODULE_INT, sih_ctrl, REG_PWR_SIH_CTRL); return ret; } -- 2.41.1