Subject: [PATCH 09/12] mmc: sdhci-xenon: add initial Xenon eMMC driver

From: [email-masked] (Adrian Hunter)
Date: Tue, 14 Jun 2016 09:52:47 +0300

On 09/06/16 10:10, Gregory CLEMENT wrote:
> From: Victor Gu <[email-masked]>
> 
> This path adds the driver for the Marvell Xenon eMMC host controller
> which supports eMMC 5.1, SD 3.0.
> 
> However this driver supports only up to eMMC 5.0 since the command queue
> feature is not included (yet) in the driver.
> 
> [gregory.clement at free-electrons.com:
>  - reformulate commit log
>  - overload the sdhci_set_uhs_signaling function instead of using a quirk
>  - fix a kconfig dependency
>  - remove dead code]
> 
> Signed-off-by: Victor Gu <[email-masked]>
> Signed-off-by: Gregory CLEMENT <[email-masked]>
> ---
>  drivers/mmc/host/Kconfig       |   10 +
>  drivers/mmc/host/Makefile      |    1 +
>  drivers/mmc/host/sdhci-xenon.c | 1164 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 1175 insertions(+)
>  create mode 100644 drivers/mmc/host/sdhci-xenon.c
> 

<SNIP>

> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
> new file mode 100644
> index 000000000000..43c06db95872
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-xenon.c

<SNIP>

> +static int sdhci_xenon_delay_adj_test(struct sdhci_host *host,
> +		struct mmc_card *card, unsigned int delay,
> +		bool invert, bool phase)
> +{
> +	int ret;
> +	struct mmc_card *oldcard;
> +
> +	sdhci_xenon_set_fix_delay(host, delay, invert, phase);
> +
> +	/*
> +	 * If the card is not yet associated to the host, we
> +	 * temporally do it
> +	 */
> +	oldcard = card->host->card;
> +	if (!oldcard)
> +		card->host->card = card;
> +	ret =  card_alive(card);

This looks like an abuse of bus_ops->alive().  You will need to get
agreement with Ulf how to handle this.  I will wait for Ulf's comments
before reviewing this patch set further.

> +	card->host->card = oldcard;
> +	if (ret) {
> +		pr_debug("Xenon failed when sampling fix delay %d, inverted %d, phase %d\n",
> +			 delay, invert, phase);
> +		return -EIO;
> +	}
> +
> +	pr_debug("Xenon succeeded when sampling fixed delay %d, inverted %d, phase %d\n",
> +		 delay, invert, phase);
> +	return 0;
> +}