mmc: meson-gx: adjust and re-use constant IRQ_EN_MASK

Constant IRQ_EN_MASK has no user currently. In preparation of adding
SDIO interrupt support, revive it and adjust it to our needs.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/8056622f-2adf-4763-7423-9ccdf4ca78e1@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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

@@ -101,8 +101,7 @@
 #define   IRQ_RESP_STATUS BIT(14)
 #define   IRQ_SDIO BIT(15)
 #define   IRQ_EN_MASK \
-	(IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN | IRQ_RESP_STATUS |\
-	 IRQ_SDIO)
+	(IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN)
 
 #define SD_EMMC_CMD_CFG 0x50
 #define SD_EMMC_CMD_ARG 0x54
@@ -934,17 +933,16 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
 	struct meson_host *host = dev_id;
 	struct mmc_command *cmd;
 	struct mmc_data *data;
-	u32 irq_en, status, raw_status;
+	u32 status, raw_status;
 	irqreturn_t ret = IRQ_NONE;
 
-	irq_en = readl(host->regs + SD_EMMC_IRQ_EN);
 	raw_status = readl(host->regs + SD_EMMC_STATUS);
-	status = raw_status & irq_en;
+	status = raw_status & IRQ_EN_MASK;
 
 	if (!status) {
 		dev_dbg(host->dev,
-			"Unexpected IRQ! irq_en 0x%08x - status 0x%08x\n",
-			 irq_en, raw_status);
+			"Unexpected IRQ! irq_en 0x%08lx - status 0x%08x\n",
+			 IRQ_EN_MASK, raw_status);
 		return IRQ_NONE;
 	}
 
@@ -1226,10 +1224,8 @@ static int meson_mmc_probe(struct platform_device *pdev)
 
 	/* clear, ack and enable interrupts */
 	writel(0, host->regs + SD_EMMC_IRQ_EN);
-	writel(IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN,
-	       host->regs + SD_EMMC_STATUS);
-	writel(IRQ_CRC_ERR | IRQ_TIMEOUTS | IRQ_END_OF_CHAIN,
-	       host->regs + SD_EMMC_IRQ_EN);
+	writel(IRQ_EN_MASK, host->regs + SD_EMMC_STATUS);
+	writel(IRQ_EN_MASK, host->regs + SD_EMMC_IRQ_EN);
 
 	ret = request_threaded_irq(host->irq, meson_mmc_irq,
 				   meson_mmc_irq_thread, IRQF_ONESHOT,