mmc: sdhci-of-esdhc: add erratum eSDHC7 support

Invalid Transfer Complete (IRQSTAT[TC]) bit could be set during
multi-write operation even when the BLK_CNT in BLKATTR register
has not reached zero. Therefore, Transfer Complete might be
reported twice due to this erratum since a valid Transfer Complete
occurs when BLK_CNT reaches zero. This erratum is to fix this issue

Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 57a4489..df601a7 100644 (file)
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -24,6 +24,7 @@
 #include <linux/ktime.h>
 #include <linux/dma-mapping.h>
 #include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h>
 #include "sdhci-pltfm.h"
 #include "sdhci-esdhc.h"
 
@@ -867,6 +868,25 @@ static void esdhc_set_uhs_signaling(struct sdhci_host *host,
                sdhci_set_uhs_signaling(host, timing);
 }
 
+static u32 esdhc_irq(struct sdhci_host *host, u32 intmask)
+{
+       u32 command;
+
+       if (of_find_compatible_node(NULL, NULL,
+                               "fsl,p2020-esdhc")) {
+               command = SDHCI_GET_CMD(sdhci_readw(host,
+                                       SDHCI_COMMAND));
+               if (command == MMC_WRITE_MULTIPLE_BLOCK &&
+                               sdhci_readw(host, SDHCI_BLOCK_COUNT) &&
+                               intmask & SDHCI_INT_DATA_END) {
+                       intmask &= ~SDHCI_INT_DATA_END;
+                       sdhci_writel(host, SDHCI_INT_DATA_END,
+                                       SDHCI_INT_STATUS);
+               }
+       }
+       return intmask;
+}
+
 #ifdef CONFIG_PM_SLEEP
 static u32 esdhc_proctl;
 static int esdhc_of_suspend(struct device *dev)
@@ -914,6 +934,7 @@ static const struct sdhci_ops sdhci_esdhc_be_ops = {
        .set_bus_width = esdhc_pltfm_set_bus_width,
        .reset = esdhc_reset,
        .set_uhs_signaling = esdhc_set_uhs_signaling,
+       .irq = esdhc_irq,
 };
 
 static const struct sdhci_ops sdhci_esdhc_le_ops = {
@@ -931,6 +952,7 @@ static const struct sdhci_ops sdhci_esdhc_le_ops = {
        .set_bus_width = esdhc_pltfm_set_bus_width,
        .reset = esdhc_reset,
        .set_uhs_signaling = esdhc_set_uhs_signaling,
+       .irq = esdhc_irq,
 };
 
 static const struct sdhci_pltfm_data sdhci_esdhc_be_pdata = {