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authorAndrzej Hajda <a.hajda@samsung.com>2017-02-22 11:11:20 +0100
committerWolfram Sang <wsa@the-dreams.de>2017-02-23 12:59:48 +0100
commitfd1c9c8568439198a66f42108a9b01854e25346e (patch)
tree0b88f808a983e8670ab1f6cbba3d22bba1a057e2 /drivers/i2c
parente3ccc921b7d8fd1fcd10a00720e09823d8078666 (diff)
downloadlinux-fd1c9c8568439198a66f42108a9b01854e25346e.tar.bz2
i2c: exynos5: disable fifo-almost-empty irq signal when necessary
Fifo-almost-empty irq signal should be disabled as soon as possible, to avoid unnecessary interrupt storm. The best moment is when there is no more data to feed fifo. This patch fixes system stalls caused by IRQ storm. Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Andi Shyti <andi.shyti@samsung.com> Reviewed-by: Andi Shyti <andi.shyti@samsung.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-exynos5.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-exynos5.c b/drivers/i2c/busses/i2c-exynos5.c
index bea607149972..00e81e3564ff 100644
--- a/drivers/i2c/busses/i2c-exynos5.c
+++ b/drivers/i2c/busses/i2c-exynos5.c
@@ -502,8 +502,13 @@ static irqreturn_t exynos5_i2c_irq(int irqno, void *dev_id)
fifo_level = HSI2C_TX_FIFO_LVL(fifo_status);
len = i2c->variant->fifo_depth - fifo_level;
- if (len > (i2c->msg->len - i2c->msg_ptr))
+ if (len > (i2c->msg->len - i2c->msg_ptr)) {
+ u32 int_en = readl(i2c->regs + HSI2C_INT_ENABLE);
+
+ int_en &= ~HSI2C_INT_TX_ALMOSTEMPTY_EN;
+ writel(int_en, i2c->regs + HSI2C_INT_ENABLE);
len = i2c->msg->len - i2c->msg_ptr;
+ }
while (len > 0) {
byte = i2c->msg->buf[i2c->msg_ptr++];