Re: [PATCH 7/10] mmc: sdhci-xenon: Add support to PHYs of Marvell Xenon SDHC

[Adrian Hunter <adrian.hunter@intel.com>]

On 07/10/16 18:22, Gregory CLEMENT wrote:
> From: Ziji Hu <huziji@marvell.com>
> 
> Marvell Xenon eMMC/SD/SDIO Host Controller contains PHY.
> Three types of PHYs are supported.
> 
> Add support to multiple types of PHYs init and configuration.
> Add register definitions of PHYs.
> 
> Signed-off-by: Hu Ziji <huziji@marvell.com>
> Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
> Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
> ---
>  MAINTAINERS                        |    1 +-
>  drivers/mmc/host/Makefile          |    2 +-
>  drivers/mmc/host/sdhci-xenon-phy.c | 1141 +++++++++++++++++++++++++++++-
>  drivers/mmc/host/sdhci-xenon-phy.h |  157 ++++-
>  drivers/mmc/host/sdhci-xenon.c     |    4 +-
>  drivers/mmc/host/sdhci-xenon.h     |   17 +-
>  6 files changed, 1321 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/mmc/host/sdhci-xenon-phy.c
>  create mode 100644 drivers/mmc/host/sdhci-xenon-phy.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 859420e5dfd3..b5673c2ee5f2 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -7583,6 +7583,7 @@ M:	Ziji Hu <huziji@marvell.com>
>  L:	linux-mmc@vger.kernel.org
>  S:	Supported
>  F:	drivers/mmc/host/sdhci-xenon.*
> +F:	drivers/mmc/host/sdhci-xenon-phy.*
>  F:	Documentation/devicetree/bindings/mmc/marvell,sdhci-xenon.txt
>  
>  MATROX FRAMEBUFFER DRIVER
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 75eaf743486c..4f2854556ff7 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -82,4 +82,4 @@ ifeq ($(CONFIG_CB710_DEBUG),y)
>  endif
>  
>  obj-$(CONFIG_MMC_SDHCI_XENON)	+= sdhci-xenon-driver.o
> -sdhci-xenon-driver-y		+= sdhci-xenon.o
> +sdhci-xenon-driver-y		+= sdhci-xenon.o sdhci-xenon-phy.o
> diff --git a/drivers/mmc/host/sdhci-xenon-phy.c b/drivers/mmc/host/sdhci-xenon-phy.c
> new file mode 100644
> index 000000000000..4eb8fea1bec9
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-xenon-phy.c

<SNIP>

> +static int __xenon_emmc_delay_adj_test(struct mmc_card *card)
> +{
> +	int err;
> +	u8 *ext_csd = NULL;
> +
> +	err = mmc_get_ext_csd(card, &ext_csd);
> +	kfree(ext_csd);
> +
> +	return err;
> +}
> +
> +static int __xenon_sdio_delay_adj_test(struct mmc_card *card)
> +{
> +	struct mmc_command cmd = {0};
> +	int err;
> +
> +	cmd.opcode = SD_IO_RW_DIRECT;
> +	cmd.flags = MMC_RSP_R5 | MMC_CMD_AC;
> +
> +	err = mmc_wait_for_cmd(card->host, &cmd, 0);
> +	if (err)
> +		return err;
> +
> +	if (cmd.resp[0] & R5_ERROR)
> +		return -EIO;
> +	if (cmd.resp[0] & R5_FUNCTION_NUMBER)
> +		return -EINVAL;
> +	if (cmd.resp[0] & R5_OUT_OF_RANGE)
> +		return -ERANGE;
> +	return 0;
> +}
> +
> +static int __xenon_sd_delay_adj_test(struct mmc_card *card)
> +{
> +	struct mmc_command cmd = {0};
> +	int err;
> +
> +	cmd.opcode = MMC_SEND_STATUS;
> +	cmd.arg = card->rca << 16;
> +	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
> +
> +	err = mmc_wait_for_cmd(card->host, &cmd, 0);
> +	return err;
> +}
> +
> +static int xenon_delay_adj_test(struct mmc_card *card)
> +{
> +	WARN_ON(!card);
> +	WARN_ON(!card->host);
> +
> +	if (mmc_card_mmc(card))
> +		return __xenon_emmc_delay_adj_test(card);
> +	else if (mmc_card_sd(card))
> +		return __xenon_sd_delay_adj_test(card);
> +	else if (mmc_card_sdio(card))
> +		return __xenon_sdio_delay_adj_test(card);
> +	else
> +		return -EINVAL;
> +}

So you are issuing commands from the ->set_ios() callback.  I would want to
get Ulf's OK for that before going further.

One thing: you will need to ensure you don't trigger get HS400 re-tuning
because it will call back into ->set_ios().

And you have the problem that you need to get a reference to the card before
the card device has been added.  As I wrote in response to the previous
patch, you should get Ulf's help with that too.