RE: [PATCH] mmc: dw_mmc: clear INSTS register when initialize

[Seungwon Jeon <tgih.jun@samsung.com>]

On Tuesday, April 23, 2013, Jaehoon Chung wrote:
> On 04/23/2013 06:57 PM, Seungwon Jeon wrote:
> > Hi,
> >
> > On Thursday, April 18, 2013, Joonyoung Shim wrote:
> >> If pending interrupt for IDMAC exists when probe, it will call interrupt
> >> handler unnecessarily.
> >>
> >> Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
> >> ---
> >>  drivers/mmc/host/dw_mmc.c |    3 +++
> >>  1 file changed, 3 insertions(+)
> >>
> >> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> >> index 323c502..b0057a2 100644
> >> --- a/drivers/mmc/host/dw_mmc.c
> >> +++ b/drivers/mmc/host/dw_mmc.c
> >> @@ -2192,6 +2192,7 @@ int dw_mci_probe(struct dw_mci *host)
> >>
> >>  	/* Clear the interrupts for the host controller */
> >>  	mci_writel(host, RINTSTS, 0xFFFFFFFF);
> >> +	mci_writel(host, IDSTS, 0xFFFFFFFF);
> > 0x337 is correct for bits. Could you check the bit filed?
> I think that don't care which reset value used.
> "It is recommended that you write 0xffff_ffff to the Raw Interrupt register @0x044 and IDSTS @0x8C
> in order to clear any pending interrupts before setting the int_enable bit."
> This boot mode case is also used the 0xffff_ffff.
In case IDSTS all 32bit are not for interrupt status unlike RINTSTS.
IDSTS[31:17] is reserved and IDSTS[16:0] also contains 'reserved' and 'read-only' field.
Correct use would be needed.

Thanks,
Seungwon Jeon
> >
> >>  	mci_writel(host, INTMASK, 0); /* disable all mmc interrupt first */
> >>
> >>  	/* Put in max timeout */
> >> @@ -2243,6 +2244,7 @@ int dw_mci_probe(struct dw_mci *host)
> >>  	 * receive ready and error such as transmit, receive timeout, crc error
> >>  	 */
> >>  	mci_writel(host, RINTSTS, 0xFFFFFFFF);
> >> +	mci_writel(host, IDSTS, 0xFFFFFFFF);
> > No need, it's already done above.
> >
> >>  	mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
> >>  		   SDMMC_INT_TXDR | SDMMC_INT_RXDR |
> >>  		   DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
> >> @@ -2393,6 +2395,7 @@ int dw_mci_resume(struct dw_mci *host)
> >>  	mci_writel(host, FIFOTH, host->fifoth_val);
> >>
> >>  	mci_writel(host, RINTSTS, 0xFFFFFFFF);
> >> +	mci_writel(host, IDSTS, 0xFFFFFFFF);
> > Same, incorrect bits.
> >
> > Thanks,
> > Seungwon Jeon
> >
> >>  	mci_writel(host, INTMASK, SDMMC_INT_CMD_DONE | SDMMC_INT_DATA_OVER |
> >>  		   SDMMC_INT_TXDR | SDMMC_INT_RXDR |
> >>  		   DW_MCI_ERROR_FLAGS | SDMMC_INT_CD);
> >> --
> >> 1.7.9.5
> >>
> >> --
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> >
> >