linux-kernel - [PATCH 05/13] mmc: bcm2835: call bcm2835_block

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Date:   Fri, 27 Jan 2017 00:37:18 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     linux-rpi-kernel@...ts.infradead.org
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Eric Anholt <eric@...olt.net>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-mmc@...r.kernel.org, Gerd Hoffmann <kraxel@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com (maintainer:BROADCOM
        BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE...),
        Stephen Warren <swarren@...dotorg.org>,
        Lee Jones <lee@...nel.org>,
        linux-arm-kernel@...ts.infradead.org (moderated list:BROADCOM BCM2835
        ARM ARCHITECTURE), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 05/13] mmc: bcm2835: call bcm2835_block_irq from irqthread

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 drivers/mmc/host/bcm2835.c | 31 ++++++++++++++++++++++---------
 1 file changed, 22 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index d25b85a..8270c76 100644
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -168,6 +168,9 @@ struct bcm2835_host {
 	bool			use_busy:1;	/* Wait for busy interrupt */
 	bool			use_sbc:1;	/* Send CMD23 */
 
+	/* for threaded irq handler */
+	bool                    irq_block;
+
 	/* DMA part */
 	struct dma_chan		*dma_chan_rx;
 	struct dma_chan		*dma_chan_tx;
@@ -1035,18 +1038,13 @@ static void bcm2835_data_irq(struct bcm2835_host *host, u32 intmask)
 	}
 }
 
-static void bcm2835_block_irq(struct bcm2835_host *host, u32 intmask)
+static void bcm2835_block_irq(struct bcm2835_host *host)
 {
-	if (!host->data) {
-		dev_err(&host->pdev->dev,
-			"got block interrupt 0x%08x even though no data operation was in progress.\n",
-			(unsigned int)intmask);
+	if (WARN_ON(!host->data)) {
 		bcm2835_dumpregs(host);
 		return;
 	}
 
-	bcm2835_check_data_error(host, intmask);
-
 	if (!host->dma_desc) {
 		WARN_ON(!host->blocks);
 		if (host->data->error || (--host->blocks == 0))
@@ -1075,8 +1073,9 @@ static irqreturn_t bcm2835_irq(int irq, void *dev_id)
 	       host->ioaddr + SDHSTS);
 
 	if (intmask & SDHSTS_BLOCK_IRPT) {
-		bcm2835_block_irq(host, intmask);
-		result = IRQ_HANDLED;
+		bcm2835_check_data_error(host, intmask);
+		host->irq_block = true;
+		result = IRQ_WAKE_THREAD;
 	}
 
 	if (intmask & SDHSTS_BUSY_IRPT) {
@@ -1101,6 +1100,20 @@ static irqreturn_t bcm2835_irq(int irq, void *dev_id)
 
 static irqreturn_t bcm2835_threaded_irq(int irq, void *dev_id)
 {
+	struct bcm2835_host *host = dev_id;
+	unsigned long flags;
+	bool block;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	block = host->irq_block;
+	host->irq_block = false;
+
+	if (block)
+		bcm2835_block_irq(host);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
 	return IRQ_HANDLED;
 }
 
-- 
1.8.3.1