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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>
This commit is contained in:
Steven Feng 2017-05-23 15:13:24 +08:00 committed by Lee Jones
parent 9b79ff104f
commit 87d284443d
2 changed files with 20 additions and 2 deletions
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17
drivers/mfd/rtsx_pcr.c
View File

@ -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) {

5
include/linux/mfd/rtsx_pci.h
View File

@ -850,6 +850,9 @@
#define rtsx_pci_init_cmd(pcr) ((pcr)->ci = 0)
#define RTS5227_DEVICE_ID 0x5227
#define RTS_MAX_TIMES_FREQ_REDUCTION 8
struct rtsx_pcr;
struct pcr_handle {
@ -957,6 +960,8 @@ struct rtsx_pcr {
int num_slots;
struct rtsx_slot *slots;
u8 dma_error_count;
};
#define CHK_PCI_PID(pcr, pid) ((pcr)->pci->device == (pid))