linux-kernel - Re: [PATCH] mmc: dw_mmc-rockchip: fix failing to mount partition with "discard"

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Date:	Wed, 02 Mar 2016 10:29:30 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	Shawn Lin <shawn.lin@...k-chips.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH] mmc: dw_mmc-rockchip: fix failing to mount partition with
 "discard"

Hi Shawn.

On 03/01/2016 04:12 PM, Shawn Lin wrote:
> Without MMC_CAP_ERASE support, we fail to mount partition
> with "discard" option since mmc_queue_setup_discard is limited
> for checking mmc_can_erase. Without doing mmc_queue_setup_discard,
> blk_queue_discard fails to test QUEUE_FLAG_DISCARD flag, so we get
> the following log from f2fs(actually similar to other file system):
> 
> mounting with "discard" option, but the device does not support discard

We can enable MMC_CAP_ERASE by default, since other SoC also needs this capability.
I had sent some patch for enabling by default, but at that time i didn't remember why not enabled by default.
I will check that reason..and share the information.

Best Regards,
Jaehoon Chung

> 
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
> ---
> 
>  drivers/mmc/host/dw_mmc-rockchip.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
> index 84e50f3..2eda118 100644
> --- a/drivers/mmc/host/dw_mmc-rockchip.c
> +++ b/drivers/mmc/host/dw_mmc-rockchip.c
> @@ -234,11 +234,20 @@ static int dw_mci_rockchip_init(struct dw_mci *host)
>  	return 0;
>  }
>  
> +/* Common capabilities of RK3288 SoC */
> +static unsigned long dw_mci_rk3288_dwmmc_caps[4] = {
> +	MMC_CAP_ERASE,
> +	MMC_CAP_ERASE,
> +	MMC_CAP_ERASE,
> +	MMC_CAP_ERASE,
> +};
> +
>  static const struct dw_mci_drv_data rk2928_drv_data = {
>  	.init			= dw_mci_rockchip_init,
>  };
>  
>  static const struct dw_mci_drv_data rk3288_drv_data = {
> +	.caps			= dw_mci_rk3288_dwmmc_caps,
>  	.set_ios		= dw_mci_rk3288_set_ios,
>  	.execute_tuning		= dw_mci_rk3288_execute_tuning,
>  	.parse_dt		= dw_mci_rk3288_parse_dt,
>