Re: [PATCH v4] mfd:rtsx: do retry when DMA transfer error

From: Lee Jones
Date: Wed Apr 26 2017 - 04:51:54 EST


On Wed, 26 Apr 2017, åälinux wrote:

> Hi lee.jones:
> I have just now resented the patch V4, please review it.

Please don't sent chaser emails.

Especially demanding ones sent within hours/minutes of the patch.

> steven feng
> Realsil Microelectronics CO. LTD.
> Mobileï181-6899-0403 Extï57594
>
> On 2017å04æ26æ 10:47, åälinux wrote:
> > From: Steven Feng <steven_feng@xxxxxxxxxxxxxx>
> >
> > 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@xxxxxxxxxxxxxx>
> > ---
> > drivers/mfd/rtsx_pcr.c | 18 ++++++++++++++++--
> > include/linux/mfd/rtsx_pci.h | 5 +++++
> > 2 files changed, 21 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/mfd/rtsx_pcr.c b/drivers/mfd/rtsx_pcr.c
> > index 98029ee..8e21fd6 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 +664,14 @@ int rtsx_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock,
> > if (err < 0)
> > return err;
> >
> > + /* Reduce MMC 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 +907,7 @@ 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) {
> > diff --git a/include/linux/mfd/rtsx_pci.h b/include/linux/mfd/rtsx_pci.h
> > index 7eb7cba..116816f 100644
> > --- a/include/linux/mfd/rtsx_pci.h
> > +++ b/include/linux/mfd/rtsx_pci.h
> > @@ -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))
>

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--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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