Hi James,
If I understand your concern correctly, for level triggered
interrupts,the interrupt action needs to taken first,than the
interrupt source needs to be cleared,only then I can clear Raw
Interrupt Status register right ?
So ,accordingly ,will the below code be in appropriate order ?
if (pending & SDMMC_INT_SDIO(i)) {
mmc_signal_sdio_irq(slot->mmc);
mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
On Tue, Aug 23, 2011 at 7:56 PM, James Hogan <[email protected]> wrote:
> Hi,
>
> On 23 August 2011 14:20, Shashidhar Hiremath
> <[email protected]> wrote:
>> The Patch adds the support for SDIO interrupts for all slots.
>> It includes enabling of SDIO interrupts through dw_mci_enable_sdio_irq
>> and the handling of the slot specific interrupts in the Interrupt Service
>> Routine.
>>
>> Signed-off-by: Shashidhar Hiremath <[email protected]>
>> ---
>> v2:
>> * As per Suggestions by James Hogan
>> -fixed code that was disabling other interrupts.
>> -removed [int_mask &= 0xFFFF0000; and int_mask &= 0xFFFF0000;] as it
>> was unnecessary
>> -modified (slot->id + 16) with appropriate Macro SDMMC_INT_SDIO(i)
>> drivers/mmc/host/dw_mmc.c | 35 +++++++++++++++++++++++++++++++----
>> drivers/mmc/host/dw_mmc.h | 2 +-
>> 2 files changed, 32 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
>> index 66dcddb..b06f8f1 100644
>> --- a/drivers/mmc/host/dw_mmc.c
>> +++ b/drivers/mmc/host/dw_mmc.c
>> @@ -746,11 +746,29 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
>> return present;
>> }
>>
>> +static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
>> +{
>> + struct dw_mci_slot *slot = mmc_priv(mmc);
>> + struct dw_mci *host = slot->host;
>> + u32 int_mask;
>> +
>> + /* Enable/disable Slot Specific SDIO interrupt */
>> + int_mask = mci_readl(host, INTMASK);
>> + if (enb) {
>> + mci_writel(host, INTMASK,
>> + (int_mask | (1 << SDMMC_INT_SDIO(slot->id))));
>> + } else {
>> + mci_writel(host, INTMASK,
>> + (int_mask & ~(1 << SDMMC_INT_SDIO(slot->id))));
>> + }
>> +}
>> +
>> static const struct mmc_host_ops dw_mci_ops = {
>> - .request = dw_mci_request,
>> - .set_ios = dw_mci_set_ios,
>> - .get_ro = dw_mci_get_ro,
>> - .get_cd = dw_mci_get_cd,
>> + .request = dw_mci_request,
>> + .set_ios = dw_mci_set_ios,
>> + .get_ro = dw_mci_get_ro,
>> + .get_cd = dw_mci_get_cd,
>> + .enable_sdio_irq = dw_mci_enable_sdio_irq,
>> };
>>
>> static void dw_mci_request_end(struct dw_mci *host, struct mmc_request *mrq)
>> @@ -1179,6 +1197,7 @@ static irqreturn_t dw_mci_interrupt(int irq, void
>> *dev_id)
>> struct dw_mci *host = dev_id;
>> u32 status, pending;
>> unsigned int pass_count = 0;
>> + int i;
>>
>> do {
>> status = mci_readl(host, RINTSTS);
>> @@ -1249,6 +1268,14 @@ static irqreturn_t dw_mci_interrupt(int irq,
>> void *dev_id)
>> tasklet_schedule(&host->card_tasklet);
>> }
>>
>> + /* Handle SDIO Interrupts */
>> + for (i = 0; i < host->num_slots; i++) {
>> + struct dw_mci_slot *slot = host->slot[i];
>> + if (pending & SDMMC_INT_SDIO(i)) {
>> + mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
>> + mmc_signal_sdio_irq(slot->mmc);
>
> A potential problem that just occured to me, is that the TRM says (in
> the note after the table of interrupt status bits):
> "The SDIO interrupts, receive fifo data request (RXDR), and transmit
> FIFO data request (txdr) are set by level-sensitive interrupt sources.
> Therefore, the interrupt source should be first cleared before you can
> clear the interrupt bit of the Raw interrupt register"
>
> I'm guessing the source would get cleared somewhere in the
> mmc_signal_sdio_irq function, depending on the sdio driver, therefore
> I think it'd be more correct to clear each interrupt after the
> mmc_signal_sdio_irq() call to prevent it immediately retriggering.
>
> Cheers
> James
>
>> + }
>> + }
>> } while (pass_count++ < 5);
>>
>> #ifdef CONFIG_MMC_DW_IDMAC
>> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
>> index 23c662a..ecf1043 100644
>> --- a/drivers/mmc/host/dw_mmc.h
>> +++ b/drivers/mmc/host/dw_mmc.h
>> @@ -82,7 +82,7 @@
>> #define SDMMC_CTYPE_4BIT BIT(0)
>> #define SDMMC_CTYPE_1BIT 0
>> /* Interrupt status & mask register defines */
>> -#define SDMMC_INT_SDIO BIT(16)
>> +#define SDMMC_INT_SDIO(n) BIT((16 + (n)))
>> #define SDMMC_INT_EBE BIT(15)
>> #define SDMMC_INT_ACD BIT(14)
>> #define SDMMC_INT_SBE BIT(13)
>> --
>> 1.7.2.3
>>
>>
>> --
>> regards,
>> Shashidhar Hiremath
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
>> the body of a message to [email protected]
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>
>
>
> --
> James Hogan
>
--
regards,
Shashidhar Hiremath
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