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authorSteven Feng2017-05-23 15:13:24 +0800
committerLee Jones2017-07-06 08:29:11 +0100
commit87d284443d071dc70344dda4b2fb43723686acdb (patch)
tree4dad341884d0ab06c71f17a83976e9b04e04b76f /drivers/mfd
parent9b79ff104f73de63efc958cc0dec3c826aee3ffd (diff)
mfd: rtsx: Do retry when DMA transfer error
The request should be resent when DMA transfer error occurred. For rts5227, the clock rate needs to be reduced when error occurred. Signed-off-by: Steven Feng <steven_feng@realsil.com.cn> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/rtsx_pcr.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/mfd/rtsx_pcr.c b/drivers/mfd/rtsx_pcr.c
index 850590aac008..a0ac89dfdf0f 100644
--- a/drivers/mfd/rtsx_pcr.c
+++ b/drivers/mfd/rtsx_pcr.c
@@ -30,6 +30,7 @@
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rtsx_pci.h>
+#include <linux/mmc/card.h>
#include <asm/unaligned.h>
#include "rtsx_pcr.h"
@@ -452,8 +453,12 @@ int rtsx_pci_dma_transfer(struct rtsx_pcr *pcr, struct scatterlist *sglist,
}
spin_lock_irqsave(&pcr->lock, flags);
- if (pcr->trans_result == TRANS_RESULT_FAIL)
- err = -EINVAL;
+ if (pcr->trans_result == TRANS_RESULT_FAIL) {
+ err = -EILSEQ;
+ if (pcr->dma_error_count < RTS_MAX_TIMES_FREQ_REDUCTION)
+ pcr->dma_error_count++;
+ }
+
else if (pcr->trans_result == TRANS_NO_DEVICE)
err = -ENODEV;
spin_unlock_irqrestore(&pcr->lock, flags);
@@ -659,6 +664,13 @@ int rtsx_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock,
if (err < 0)
return err;
+ /* Reduce card clock by 20MHz each time a DMA transfer error occurs */
+ if (card_clock == UHS_SDR104_MAX_DTR &&
+ pcr->dma_error_count &&
+ PCI_PID(pcr) == RTS5227_DEVICE_ID)
+ card_clock = UHS_SDR104_MAX_DTR -
+ (pcr->dma_error_count * 20000000);
+
card_clock /= 1000000;
pcr_dbg(pcr, "Switch card clock to %dMHz\n", card_clock);
@@ -894,6 +906,7 @@ static irqreturn_t rtsx_pci_isr(int irq, void *dev_id)
pcr->card_removed |= SD_EXIST;
pcr->card_inserted &= ~SD_EXIST;
}
+ pcr->dma_error_count = 0;
}
if (int_reg & MS_INT) {