linux-kernel - [PATCH V3 1/3] mmc: mmci: fix read status for busy detect

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Date:   Mon, 3 Jun 2019 17:55:23 +0200
From:   Ludovic Barre <ludovic.Barre@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     <srinivas.kandagatla@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mmc@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Ludovic Barre <ludovic.barre@...com>
Subject: [PATCH V3 1/3] mmc: mmci: fix read status for busy detect

From: Ludovic Barre <ludovic.barre@...com>

"busy_detect_flag" is used to read & clear busy value of mmci status.
"busy_detect_mask" is used to manage busy irq of mmci mask.
So to read mmci status the busy_detect_flag must be take account.
if the variant does not support busy detect feature the flag is null
and there is no impact.

Not need to re-read the status register in mmci_cmd_irq, the
status parameter can be used.

Signed-off-by: Ludovic Barre <ludovic.barre@...com>
---
 drivers/mmc/host/mmci.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 356833a..5b5cc45 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1240,7 +1240,7 @@ mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
 		 */
 		if (!host->busy_status &&
 		    !(status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT)) &&
-		    (readl(base + MMCISTATUS) & host->variant->busy_detect_flag)) {
+		    (status & host->variant->busy_detect_flag)) {
 
 			/* Clear the busy start IRQ */
 			writel(host->variant->busy_detect_mask,
@@ -1517,7 +1517,8 @@ static irqreturn_t mmci_irq(int irq, void *dev_id)
 		 * to make sure that both start and end interrupts are always
 		 * cleared one after the other.
 		 */
-		status &= readl(host->base + MMCIMASK0);
+		status &= readl(host->base + MMCIMASK0) |
+			host->variant->busy_detect_flag;
 		if (host->variant->busy_detect)
 			writel(status & ~host->variant->busy_detect_mask,
 			       host->base + MMCICLEAR);
-- 
2.7.4