linux-kernel - Re: [PATCH] mmc: dw_mmc: remove DW_MCI_QUIRK_BROKEN_CARD

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Message-id: <56A037A4.4040402@samsung.com>
Date:	Thu, 21 Jan 2016 10:43:00 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	Shawn Lin <shawn.lin@...k-chips.com>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: dw_mmc: remove DW_MCI_QUIRK_BROKEN_CARD_DETECTION
 quirk

Hi, Shawn.

After applied this patch at my dw-mmc git, i found some problem.
So I will revert this until fixing problem.

On 01/18/2016 05:50 PM, Shawn Lin wrote:
> dw_mmc already use mmc_of_parse to get "broken-cd" property,
> but it considered "broken-cd" to be a quirk in its driver. We
> don't need this quirk here, and just take what we need from
> mmc->caps.
> 
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
> ---
> 
>  drivers/mmc/host/dw_mmc.c  | 23 +++--------------------
>  include/linux/mmc/dw_mmc.h |  4 +---
>  2 files changed, 4 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 7128351..bbf9ca6 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -1450,12 +1450,11 @@ static int dw_mci_get_cd(struct mmc_host *mmc)
>  {
>  	int present;
>  	struct dw_mci_slot *slot = mmc_priv(mmc);
> -	struct dw_mci_board *brd = slot->host->pdata;
>  	struct dw_mci *host = slot->host;
>  	int gpio_cd = mmc_gpio_get_cd(mmc);
>  
>  	/* Use platform get_cd function, else try onboard card detect */
> -	if ((brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION) ||
> +	if ((mmc->caps & MMC_CAP_NEEDS_POLL) ||
>  	    (mmc->caps & MMC_CAP_NONREMOVABLE))
>  		present = 1;
>  	else if (!IS_ERR_VALUE(gpio_cd))
> @@ -2840,23 +2839,13 @@ static void dw_mci_dto_timer(unsigned long arg)
>  }
>  
>  #ifdef CONFIG_OF
> -static struct dw_mci_of_quirks {
> -	char *quirk;
> -	int id;
> -} of_quirks[] = {
> -	{
> -		.quirk	= "broken-cd",
> -		.id	= DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
> -	},
> -};
> -
>  static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
>  {
>  	struct dw_mci_board *pdata;
>  	struct device *dev = host->dev;
>  	struct device_node *np = dev->of_node;
>  	const struct dw_mci_drv_data *drv_data = host->drv_data;
> -	int idx, ret;
> +	int ret;
>  	u32 clock_frequency;
>  
>  	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> @@ -2871,11 +2860,6 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
>  		pdata->num_slots = 1;
>  	}
>  
> -	/* get quirks */
> -	for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
> -		if (of_get_property(np, of_quirks[idx].quirk, NULL))
> -			pdata->quirks |= of_quirks[idx].id;
> -
>  	if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
>  		dev_info(dev,
>  			 "fifo-depth property not found, using value of FIFOTH register as default\n");
> @@ -2908,13 +2892,12 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
>  
>  static void dw_mci_enable_cd(struct dw_mci *host)
>  {
> -	struct dw_mci_board *brd = host->pdata;
>  	unsigned long irqflags;
>  	u32 temp;
>  	int i;
>  
>  	/* No need for CD if broken card detection */
> -	if (brd->quirks & DW_MCI_QUIRK_BROKEN_CARD_DETECTION)
> +	if (host->cur_slot->mmc->caps & MMC_CAP_NEEDS_POLL)

dw_mci_enable_cd is called in dw_mci_probe.
So host->cur_slot is not assigned to anything..

Best Regards,
Jaehoon Chung

>  		return;
>  
>  	/* No need for CD if all slots have a non-error GPIO */
> diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
> index 89df7ab..250d822 100644
> --- a/include/linux/mmc/dw_mmc.h
> +++ b/include/linux/mmc/dw_mmc.h
> @@ -235,10 +235,8 @@ struct dw_mci_dma_ops {
>  };
>  
>  /* IP Quirks/flags. */
> -/* Unreliable card detection */
> -#define DW_MCI_QUIRK_BROKEN_CARD_DETECTION	BIT(0)
>  /* Timer for broken data transfer over scheme */
> -#define DW_MCI_QUIRK_BROKEN_DTO			BIT(1)
> +#define DW_MCI_QUIRK_BROKEN_DTO			BIT(0)
>  
>  struct dma_pdata;
>  
>