Hi again,
> From: Yoshihiro Shimoda, Sent: Thursday, May 21, 2020 4:01 PM
> To: ulf.hansson@xxxxxxxxxx; wsa+renesas@xxxxxxxxxxxxxxxxxxxx
> Cc: linux-mmc@xxxxxxxxxxxxxxx; linux-renesas-soc@xxxxxxxxxxxxxxx; Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> Subject: [PATCH 0/3] mmc: tmio and renesas_sdhi_internal_dmac: fix dma unmapping
>
> This patch series is based on mmc.git / next branch.
Note that this patch series is tested by using additional debug code [1],
because there is difficult to reproduce this issue. Before apply patch,
When I enabled CONFIG_DMA_API_DEBUG and CONFIG_DMA_API_DEBUG_SG,
I observed lacking dma unmapping on /sys/kernel/debug/dma-api/dump.
And then I confirmed the patch can fix the issue.
---
[1]
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index adc2bf7..1df00f6 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -192,6 +192,7 @@ struct tmio_mmc_host {
void (*hs400_complete)(struct tmio_mmc_host *host);
const struct tmio_mmc_dma_ops *dma_ops;
+ int debug;
};
struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev,
diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index 946fb01..f8fe905 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -552,7 +552,8 @@ static void tmio_mmc_cmd_irq(struct tmio_mmc_host *host, unsigned int stat)
cmd->resp[0] = cmd->resp[3];
}
- if (stat & TMIO_STAT_CMDTIMEOUT)
+ host->debug++;
+ if (stat & TMIO_STAT_CMDTIMEOUT || !(host->debug & 0xff))
cmd->error = -ETIMEDOUT;
else if ((stat & TMIO_STAT_CRCFAIL && cmd->flags & MMC_RSP_CRC) ||
stat & TMIO_STAT_STOPBIT_ERR ||
