Hi Chris,
> Polling SDIO_CCCR_INTx could create a fake interrupt with Marvell
> SD8797 card. Add a quirk to handle this case. The fixup here is
> to issue a dummy CMD52 read to function 0 register 0xff, and this
> dummy read must be right after SDIO_CCCR_INTx is read.
>
> Patch has been verified on a dw_mmc controller (Samsung Chromebook)
> with MMC_CAP_SDIO_IRQ disabled.
Could you please review this patch?
Thanks,
Bing
>
> Reviewed-by: Paul Stewart <pstew@xxxxxxxxxxxx>
> Reviewed-by: Doug Anderson <dianders@xxxxxxxxxxxx>
> Signed-off-by: Bing Zhao <bzhao@xxxxxxxxxxx>
> Acked-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> ---
> v2: remove mmc_fixup_broken_irq_polling() and add inline
> mmc_card_broken_irq_polling(). (Ulf Hansson)
> invoke the quirk handling after 'ret' value is validated.
> v3: remove unnecessary include for sdio_ops.h (Ulf Hansson)
>
> drivers/mmc/core/quirks.c | 8 ++++++++
> drivers/mmc/core/sdio_irq.c | 11 +++++++++++
> include/linux/mmc/card.h | 8 +++++++-
> 3 files changed, 26 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/core/quirks.c b/drivers/mmc/core/quirks.c
> index 06ee1ae..6c36fcc 100644
> --- a/drivers/mmc/core/quirks.c
> +++ b/drivers/mmc/core/quirks.c
> @@ -13,6 +13,7 @@
> #include <linux/kernel.h>
> #include <linux/export.h>
> #include <linux/mmc/card.h>
> +#include <linux/mmc/sdio_ids.h>
>
> #ifndef SDIO_VENDOR_ID_TI
> #define SDIO_VENDOR_ID_TI 0x0097
> @@ -30,6 +31,10 @@
> #define SDIO_DEVICE_ID_STE_CW1200 0x2280
> #endif
>
> +#ifndef SDIO_DEVICE_ID_MARVELL_8797_F0
> +#define SDIO_DEVICE_ID_MARVELL_8797_F0 0x9128
> +#endif
> +
> /*
> * This hook just adds a quirk for all sdio devices
> */
> @@ -58,6 +63,9 @@ static const struct mmc_fixup mmc_fixup_methods[] = {
> SDIO_FIXUP(SDIO_VENDOR_ID_STE, SDIO_DEVICE_ID_STE_CW1200,
> add_quirk, MMC_QUIRK_BROKEN_BYTE_MODE_512),
>
> + SDIO_FIXUP(SDIO_VENDOR_ID_MARVELL, SDIO_DEVICE_ID_MARVELL_8797_F0,
> + add_quirk, MMC_QUIRK_BROKEN_IRQ_POLLING),
> +
> END_FIXUP
> };
>
> diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c
> index 3d8ceb4..417d2f0 100644
> --- a/drivers/mmc/core/sdio_irq.c
> +++ b/drivers/mmc/core/sdio_irq.c
> @@ -53,6 +53,17 @@ static int process_sdio_pending_irqs(struct mmc_host *host)
> return ret;
> }
>
> + if (pending && mmc_card_broken_irq_polling(card) &&
> + !(host->caps & MMC_CAP_SDIO_IRQ)) {
> + unsigned char dummy;
> +
> + /* A fake interrupt could be created when we poll SDIO_CCCR_INTx
> + * register with a Marvell SD8797 card. A dummy CMD52 read to
> + * function 0 register 0xff can aviod this.
> + */
> + mmc_io_rw_direct(card, 0, 0, 0xff, 0, &dummy);
> + }
> +
> count = 0;
> for (i = 1; i <= 7; i++) {
> if (pending & (1 << i)) {
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 176fdf8..b730272 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -271,9 +271,10 @@ struct mmc_card {
> #define MMC_QUIRK_INAND_CMD38 (1<<6) /* iNAND devices have broken CMD38 */
> #define MMC_QUIRK_BLK_NO_CMD23 (1<<7) /* Avoid CMD23 for regular multiblock */
> #define MMC_QUIRK_BROKEN_BYTE_MODE_512 (1<<8) /* Avoid sending 512 bytes in */
> + /* byte mode */
> #define MMC_QUIRK_LONG_READ_TIME (1<<9) /* Data read time > CSD says */
> #define MMC_QUIRK_SEC_ERASE_TRIM_BROKEN (1<<10) /* Skip secure for erase/trim */
> - /* byte mode */
> +#define MMC_QUIRK_BROKEN_IRQ_POLLING (1<<11) /* Polling SDIO_CCCR_INTx could create a fake
> interrupt */
>
> unsigned int erase_size; /* erase size in sectors */
> unsigned int erase_shift; /* if erase unit is power 2 */
> @@ -505,6 +506,11 @@ static inline int mmc_card_long_read_time(const struct mmc_card *c)
> return c->quirks & MMC_QUIRK_LONG_READ_TIME;
> }
>
> +static inline int mmc_card_broken_irq_polling(const struct mmc_card *c)
> +{
> + return c->quirks & MMC_QUIRK_BROKEN_IRQ_POLLING;
> +}
> +
> #define mmc_card_name(c) ((c)->cid.prod_name)
> #define mmc_card_id(c) (dev_name(&(c)->dev))
>
> --
> 1.8.0
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