openwrt/target/linux/bcm27xx/patches-4.19/950-0463-mmc-sdhci-Mask-spurious-interrupts.patch

From be309b7db77215610d5ac15bf0aacd47ea5b3433 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 28 Sep 2018 16:24:05 +0100
Subject: [PATCH] mmc: sdhci: Mask "spurious" interrupts

Add a filter for "spurious" Transfer Complete interrupts, attempting
to make it as specific as possible:
* INT_DATA_END (transfer complete) is set
* There is a stop command in progress
* There is no data transfer in progress

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 drivers/mmc/host/sdhci.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2935,6 +2935,10 @@ static irqreturn_t sdhci_irq(int irq, vo
 			result = IRQ_WAKE_THREAD;
 		}
 
+		if ((intmask & SDHCI_INT_DATA_END) && !host->data &&
+		    host->cmd && (host->cmd == host->cmd->mrq->stop))
+			intmask &= ~SDHCI_INT_DATA_END;
+
 		if (intmask & SDHCI_INT_CMD_MASK)
 			sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK, &intmask);