1 files changed, 15 insertions, 2 deletions

diff --git a/drivers/media/video/cx18/cx18-io.c b/drivers/media/video/cx18/cx18-io.c
index 700ab9439c16..220fae8d4ad7 100644
--- a/drivers/media/video/cx18/cx18-io.c
+++ b/drivers/media/video/cx18/cx18-io.c
@@ -88,6 +88,19 @@ void cx18_writel_retry(struct cx18 *cx, u32 val, void __iomem *addr)
         cx18_log_write_retries(cx, i, addr);
 }
 
+void _cx18_writel_expect(struct cx18 *cx, u32 val, void __iomem *addr,
+                         u32 eval, u32 mask)
+{
+        int i;
+        eval &= mask;
+        for (i = 0; i < CX18_MAX_MMIO_RETRIES; i++) {
+                cx18_writel_noretry(cx, val, addr);
+                if (eval == (cx18_readl_noretry(cx, addr) & mask))
+                        break;
+        }
+        cx18_log_write_retries(cx, i, addr);
+}
+
 void cx18_writew_retry(struct cx18 *cx, u16 val, void __iomem *addr)
 {
         int i;
@@ -218,7 +231,7 @@ void cx18_memset_io(struct cx18 *cx, void __iomem *addr, int val, size_t count)
 void cx18_sw1_irq_enable(struct cx18 *cx, u32 val)
 {
         u32 r;
-        cx18_write_reg(cx, val, SW1_INT_STATUS);
+        cx18_write_reg_expect(cx, val, SW1_INT_STATUS, ~val, val);
         r = cx18_read_reg(cx, SW1_INT_ENABLE_PCI);
         cx18_write_reg(cx, r | val, SW1_INT_ENABLE_PCI);
 }
@@ -233,7 +246,7 @@ void cx18_sw1_irq_disable(struct cx18 *cx, u32 val)
 void cx18_sw2_irq_enable(struct cx18 *cx, u32 val)
 {
         u32 r;
-        cx18_write_reg(cx, val, SW2_INT_STATUS);
+        cx18_write_reg_expect(cx, val, SW2_INT_STATUS, ~val, val);
         r = cx18_read_reg(cx, SW2_INT_ENABLE_PCI);
         cx18_write_reg(cx, r | val, SW2_INT_ENABLE_PCI);
 }