Messages in this thread | | | Subject | Re: [PATCH v1 2/3] mmc: core: Add support for SDIO async interrupt | From | AngeloGioacchino Del Regno <> | Date | Tue, 4 Jan 2022 11:23:49 +0100 |
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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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