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SubjectRe: [PATCH v1 2/3] mmc: core: Add support for SDIO async interrupt
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Il 27/12/21 09:36, Axe Yang ha scritto:
> If cap-sdio-async-int flag is set in host dts node, parse EAI
> information from SDIO CCCR interrupt externsion segment. If async
> interrupt is supported by SDIO card then send command to card to
> enable it and set enable_async_int flag in sdio_cccr structure to 1.
> The parse flow is implemented in sdio_read_cccr().
>
> Signed-off-by: Axe Yang <axe.yang@mediatek.com>

Acked-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

> ---
> drivers/mmc/core/host.c | 2 ++
> drivers/mmc/core/sdio.c | 17 +++++++++++++++++
> include/linux/mmc/card.h | 3 ++-
> include/linux/mmc/host.h | 1 +
> include/linux/mmc/sdio.h | 5 +++++
> 5 files changed, 27 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> index d4683b1d263f..7ad60fab099a 100644
> --- a/drivers/mmc/core/host.c
> +++ b/drivers/mmc/core/host.c
> @@ -401,6 +401,8 @@ int mmc_of_parse(struct mmc_host *host)
> if (device_property_read_bool(dev, "no-mmc-hs400"))
> host->caps2 &= ~(MMC_CAP2_HS400_1_8V | MMC_CAP2_HS400_1_2V |
> MMC_CAP2_HS400_ES);
> + if (device_property_read_bool(dev, "cap-sdio-async-int"))
> + host->caps2 |= MMC_CAP2_SDIO_ASYNC_INT;
>
> /* Must be after "non-removable" check */
> if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> index 68edf7a615be..335e4ada733a 100644
> --- a/drivers/mmc/core/sdio.c
> +++ b/drivers/mmc/core/sdio.c
> @@ -225,6 +225,23 @@ static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
> card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
> if (data & SDIO_DRIVE_SDTD)
> card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
> +
> + if (card->host->caps2 & MMC_CAP2_SDIO_ASYNC_INT) {
> + ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTERRUPT_EXT, 0,
> + &data);
> + if (ret)
> + goto out;
> +
> + if (data & SDIO_INTERRUPT_EXT_SAI) {
> + data |= SDIO_INTERRUPT_EXT_EAI;
> + ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_INTERRUPT_EXT,
> + data, NULL);
> + if (ret)
> + goto out;
> +
> + card->cccr.enable_async_int = 1;
> + }
> + }
> }
>
> /* if no uhs mode ensure we check for high speed */
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 37f975875102..b0deb8ca8eeb 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -219,7 +219,8 @@ struct sdio_cccr {
> wide_bus:1,
> high_power:1,
> high_speed:1,
> - disable_cd:1;
> + disable_cd:1,
> + enable_async_int:1;
> };
>
> struct sdio_cis {
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index 0c0c9a0fdf57..60c8ebe1a5e8 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -399,6 +399,7 @@ struct mmc_host {
> #define MMC_CAP2_CRYPTO 0
> #endif
> #define MMC_CAP2_ALT_GPT_TEGRA (1 << 28) /* Host with eMMC that has GPT entry at a non-standard location */
> +#define MMC_CAP2_SDIO_ASYNC_INT (1 << 29) /* SDIO host supports asynchronous interrupt */
>
> int fixed_drv_type; /* fixed driver type for non-removable media */
>
> diff --git a/include/linux/mmc/sdio.h b/include/linux/mmc/sdio.h
> index 2a05d1ac4f0e..1ef400f28642 100644
> --- a/include/linux/mmc/sdio.h
> +++ b/include/linux/mmc/sdio.h
> @@ -159,6 +159,11 @@
> #define SDIO_DTSx_SET_TYPE_A (1 << SDIO_DRIVE_DTSx_SHIFT)
> #define SDIO_DTSx_SET_TYPE_C (2 << SDIO_DRIVE_DTSx_SHIFT)
> #define SDIO_DTSx_SET_TYPE_D (3 << SDIO_DRIVE_DTSx_SHIFT)
> +
> +#define SDIO_CCCR_INTERRUPT_EXT 0x16
> +#define SDIO_INTERRUPT_EXT_SAI (1 << 0)
> +#define SDIO_INTERRUPT_EXT_EAI (1 << 1)
> +
> /*
> * Function Basic Registers (FBR)
> */
>


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