From: Shawn Lin <shawn.lin@rock-chips.com>
To: Jaehoon Chung <jh80.chung@samsung.com>, linux-mmc@vger.kernel.org
Cc: shawn.lin@rock-chips.com, ulf.hansson@linaro.org
Subject: Re: [PATCH] mmc: dw_mmc: remove the prepare_command hook
Date: Thu, 21 Jan 2016 15:14:39 +0800 [thread overview]
Message-ID: <56A0855F.308@rock-chips.com> (raw)
In-Reply-To: <1453341666-26703-1-git-send-email-jh80.chung@samsung.com>
On 2016/1/21 10:01, Jaehoon Chung wrote:
> This patch removes the prepare_command hook from entire dw_mmc driver.
> Now, almost all SoCs are using by default, except Exynos.
> It seems that dwmmc controller is using unnecessary hook.
> To know whether needs to set this bit or not,
> add the DW_MMC_CARD_NO_USE_HOLD bit.
>
> If some SoCs need to disable this in future, just set the
> DW_MMC_CARD_NO_USE_HOLD bit.
> set_bit(DW_MMC_CARD_NO_USE_HOLD, &slot->flags),
>
> Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
For dw_mmc-rockchip:
Tested-by: Shawn Lin <shawn.lin@rock-chips.com>
For the full patch:
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
> ---
> drivers/mmc/host/dw_mmc-exynos.c | 31 ++++++++++---------------------
> drivers/mmc/host/dw_mmc-pltfm.c | 19 ++-----------------
> drivers/mmc/host/dw_mmc-rockchip.c | 7 -------
> drivers/mmc/host/dw_mmc.c | 5 ++---
> drivers/mmc/host/dw_mmc.h | 3 +--
> 5 files changed, 15 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
> index 3a7e835..8790f2a 100644
> --- a/drivers/mmc/host/dw_mmc-exynos.c
> +++ b/drivers/mmc/host/dw_mmc-exynos.c
> @@ -145,6 +145,16 @@ static void dw_mci_exynos_set_clksel_timing(struct dw_mci *host, u32 timing)
> mci_writel(host, CLKSEL64, clksel);
> else
> mci_writel(host, CLKSEL, clksel);
> +
> + /*
> + * Exynos4412 and Exynos5250 extends the use of CMD register with the
> + * use of bit 29 (which is reserved on standard MSHC controllers) for
> + * optionally bypassing the HOLD register for command and data. The
> + * HOLD register should be bypassed in case there is no phase shift
> + * applied on CMD/DATA that is sent to the card.
> + */
> + if (!SDMMC_CLKSEL_GET_DRV_WD3(clksel))
> + set_bit(DW_MMC_CARD_NO_USE_HOLD, &host->cur_slot->flags);
> }
>
> #ifdef CONFIG_PM_SLEEP
> @@ -202,26 +212,6 @@ static int dw_mci_exynos_resume_noirq(struct device *dev)
> #define dw_mci_exynos_resume_noirq NULL
> #endif /* CONFIG_PM_SLEEP */
>
> -static void dw_mci_exynos_prepare_command(struct dw_mci *host, u32 *cmdr)
> -{
> - struct dw_mci_exynos_priv_data *priv = host->priv;
> - /*
> - * Exynos4412 and Exynos5250 extends the use of CMD register with the
> - * use of bit 29 (which is reserved on standard MSHC controllers) for
> - * optionally bypassing the HOLD register for command and data. The
> - * HOLD register should be bypassed in case there is no phase shift
> - * applied on CMD/DATA that is sent to the card.
> - */
> - if (priv->ctrl_type == DW_MCI_TYPE_EXYNOS7 ||
> - priv->ctrl_type == DW_MCI_TYPE_EXYNOS7_SMU) {
> - if (SDMMC_CLKSEL_GET_DRV_WD3(mci_readl(host, CLKSEL64)))
> - *cmdr |= SDMMC_CMD_USE_HOLD_REG;
> - } else {
> - if (SDMMC_CLKSEL_GET_DRV_WD3(mci_readl(host, CLKSEL)))
> - *cmdr |= SDMMC_CMD_USE_HOLD_REG;
> - }
> -}
> -
> static void dw_mci_exynos_config_hs400(struct dw_mci *host, u32 timing)
> {
> struct dw_mci_exynos_priv_data *priv = host->priv;
> @@ -500,7 +490,6 @@ static const struct dw_mci_drv_data exynos_drv_data = {
> .caps = exynos_dwmmc_caps,
> .init = dw_mci_exynos_priv_init,
> .setup_clock = dw_mci_exynos_setup_clock,
> - .prepare_command = dw_mci_exynos_prepare_command,
> .set_ios = dw_mci_exynos_set_ios,
> .parse_dt = dw_mci_exynos_parse_dt,
> .execute_tuning = dw_mci_exynos_execute_tuning,
> diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
> index 81bdeeb..c0bb0c7 100644
> --- a/drivers/mmc/host/dw_mmc-pltfm.c
> +++ b/drivers/mmc/host/dw_mmc-pltfm.c
> @@ -26,19 +26,6 @@
> #include "dw_mmc.h"
> #include "dw_mmc-pltfm.h"
>
> -static void dw_mci_pltfm_prepare_command(struct dw_mci *host, u32 *cmdr)
> -{
> - *cmdr |= SDMMC_CMD_USE_HOLD_REG;
> -}
> -
> -static const struct dw_mci_drv_data socfpga_drv_data = {
> - .prepare_command = dw_mci_pltfm_prepare_command,
> -};
> -
> -static const struct dw_mci_drv_data pistachio_drv_data = {
> - .prepare_command = dw_mci_pltfm_prepare_command,
> -};
> -
> int dw_mci_pltfm_register(struct platform_device *pdev,
> const struct dw_mci_drv_data *drv_data)
> {
> @@ -94,10 +81,8 @@ EXPORT_SYMBOL_GPL(dw_mci_pltfm_pmops);
>
> static const struct of_device_id dw_mci_pltfm_match[] = {
> { .compatible = "snps,dw-mshc", },
> - { .compatible = "altr,socfpga-dw-mshc",
> - .data = &socfpga_drv_data },
> - { .compatible = "img,pistachio-dw-mshc",
> - .data = &pistachio_drv_data },
> + { .compatible = "altr,socfpga-dw-mshc", },
> + { .compatible = "img,pistachio-dw-mshc", },
> {},
> };
> MODULE_DEVICE_TABLE(of, dw_mci_pltfm_match);
> diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
> index d9c92f3..84e50f3 100644
> --- a/drivers/mmc/host/dw_mmc-rockchip.c
> +++ b/drivers/mmc/host/dw_mmc-rockchip.c
> @@ -26,11 +26,6 @@ struct dw_mci_rockchip_priv_data {
> int default_sample_phase;
> };
>
> -static void dw_mci_rockchip_prepare_command(struct dw_mci *host, u32 *cmdr)
> -{
> - *cmdr |= SDMMC_CMD_USE_HOLD_REG;
> -}
> -
> static int dw_mci_rk3288_setup_clock(struct dw_mci *host)
> {
> host->bus_hz /= RK3288_CLKGEN_DIV;
> @@ -240,12 +235,10 @@ static int dw_mci_rockchip_init(struct dw_mci *host)
> }
>
> static const struct dw_mci_drv_data rk2928_drv_data = {
> - .prepare_command = dw_mci_rockchip_prepare_command,
> .init = dw_mci_rockchip_init,
> };
>
> static const struct dw_mci_drv_data rk3288_drv_data = {
> - .prepare_command = dw_mci_rockchip_prepare_command,
> .set_ios = dw_mci_rk3288_set_ios,
> .execute_tuning = dw_mci_rk3288_execute_tuning,
> .parse_dt = dw_mci_rk3288_parse_dt,
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index ffef24a..7238f66 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -234,7 +234,6 @@ static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
> struct mmc_data *data;
> struct dw_mci_slot *slot = mmc_priv(mmc);
> struct dw_mci *host = slot->host;
> - const struct dw_mci_drv_data *drv_data = slot->host->drv_data;
> u32 cmdr;
>
> cmd->error = -EINPROGRESS;
> @@ -296,8 +295,8 @@ static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
> cmdr |= SDMMC_CMD_DAT_WR;
> }
>
> - if (drv_data && drv_data->prepare_command)
> - drv_data->prepare_command(slot->host, &cmdr);
> + if (!test_bit(DW_MMC_CARD_NO_USE_HOLD, &slot->flags))
> + cmdr |= SDMMC_CMD_USE_HOLD_REG;
>
> return cmdr;
> }
> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
> index a14b7fc..68d5da2 100644
> --- a/drivers/mmc/host/dw_mmc.h
> +++ b/drivers/mmc/host/dw_mmc.h
> @@ -268,6 +268,7 @@ struct dw_mci_slot {
> #define DW_MMC_CARD_PRESENT 0
> #define DW_MMC_CARD_NEED_INIT 1
> #define DW_MMC_CARD_NO_LOW_PWR 2
> +#define DW_MMC_CARD_NO_USE_HOLD 3
> int id;
> int sdio_id;
> };
> @@ -277,7 +278,6 @@ struct dw_mci_slot {
> * @caps: mmc subsystem specified capabilities of the controller(s).
> * @init: early implementation specific initialization.
> * @setup_clock: implementation specific clock configuration.
> - * @prepare_command: handle CMD register extensions.
> * @set_ios: handle bus specific extensions.
> * @parse_dt: parse implementation specific device tree properties.
> * @execute_tuning: implementation specific tuning procedure.
> @@ -290,7 +290,6 @@ struct dw_mci_drv_data {
> unsigned long *caps;
> int (*init)(struct dw_mci *host);
> int (*setup_clock)(struct dw_mci *host);
> - void (*prepare_command)(struct dw_mci *host, u32 *cmdr);
> void (*set_ios)(struct dw_mci *host, struct mmc_ios *ios);
> int (*parse_dt)(struct dw_mci *host);
> int (*execute_tuning)(struct dw_mci_slot *slot, u32 opcode);
>
--
Best Regards
Shawn Lin
next prev parent reply other threads:[~2016-01-21 7:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-21 2:01 [PATCH] mmc: dw_mmc: remove the prepare_command hook Jaehoon Chung
2016-01-21 7:14 ` Shawn Lin [this message]
2016-01-22 1:27 ` Jaehoon Chung
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=56A0855F.308@rock-chips.com \
--to=shawn.lin@rock-chips.com \
--cc=jh80.chung@samsung.com \
--cc=linux-mmc@vger.kernel.org \
--cc=ulf.hansson@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox