spi: rockchip: Unmask IRQ at the final to avoid preemption

Avoid pio_write process is preempted, resulting in abnormal state.

Signed-off-by: Jon Lin <[e-mail]>
Signed-off-by: Jon <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-rockchip.c

···
 	rs->tx_left = rs->tx ? xfer->len / rs->n_bytes : 0;
 	rs->rx_left = xfer->len / rs->n_bytes;
 
-	if (rs->cs_inactive)
-		writel_relaxed(INT_RF_FULL | INT_CS_INACTIVE, rs->regs + ROCKCHIP_SPI_IMR);
-	else
-		writel_relaxed(INT_RF_FULL, rs->regs + ROCKCHIP_SPI_IMR);
+	writel_relaxed(0xffffffff, rs->regs + ROCKCHIP_SPI_ICR);
+
 	spi_enable_chip(rs, true);
 
 	if (rs->tx_left)
 		rockchip_spi_pio_writer(rs);
+
+	if (rs->cs_inactive)
+		writel_relaxed(INT_RF_FULL | INT_CS_INACTIVE, rs->regs + ROCKCHIP_SPI_IMR);
+	else
+		writel_relaxed(INT_RF_FULL, rs->regs + ROCKCHIP_SPI_IMR);
 
 	/* 1 means the transfer is in progress */
 	return 1;