1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/serial/mpsc.c b/drivers/serial/mpsc.c
index d09f2097d5b0..00924feaf621 100644
--- a/drivers/serial/mpsc.c
+++ b/drivers/serial/mpsc.c
@@ -503,7 +503,8 @@ mpsc_sdma_intr_ack(struct mpsc_port_info *pi)
 
         if (pi->mirror_regs)
                 pi->shared_regs->SDMA_INTR_CAUSE_m = 0;
-        writel(0, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE);
+        writeb(0x00, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE +
+               pi->port.line);
         return;
 }