linux-kernel - Re: [PATCH v1 2/3] mmc: core: Add support for SDIO async interrupt

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Message-ID: <a0eec26b-0148-a208-be67-888766b88137@collabora.com>
Date:   Tue, 4 Jan 2022 11:23:49 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Axe Yang <axe.yang@...iatek.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Satya Tangirala <satyat@...gle.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Lucas Stach <dev@...xeye.de>,
        Eric Biggers <ebiggers@...gle.com>,
        Andrew Jeffery <andrew@...id.au>,
        Stephen Boyd <swboyd@...omium.org>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        Yue Hu <huyue2@...ong.com>, Tian Tao <tiantao6@...ilicon.com>,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v1 2/3] mmc: core: Add support for SDIO async interrupt

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@...iatek.com>

Acked-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.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)
>    */
>