mmc: meson-gx: ack only raised irq

This is merely a clean up. It makes sense to only ack raised irqs
instead of acking everything all the time.
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/meson-gx-mmc.c

@@ -1082,9 +1082,6 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 	}
 
 out:
-	/* ack all enabled interrupts */
-	writel(irq_en, host->regs + SD_EMMC_STATUS);
-
 	if (cmd->error) {
 		/* Stop desc in case of errors */
 		u32 start = readl(host->regs + SD_EMMC_START);
@@ -1096,6 +1093,9 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 	if (ret == IRQ_HANDLED)
 		meson_mmc_request_done(host->mmc, cmd->mrq);
 
+	/* ack all raised interrupts */
+	writel(status, host->regs + SD_EMMC_STATUS);
+
 	return ret;
 }