mmc: dw_mmc: remove the prepare_command hook

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: NJaehoon Chung <jh80.chung@samsung.com>
Tested-by: NShawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: NShawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

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,

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);

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,

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;
@@ -294,8 +293,8 @@ 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;
 }

drivers/mmc/host/dw_mmc.h

@@ -265,6 +265,7 @@ 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;
 };
@@ -274,7 +275,6 @@ 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.
@@ -287,7 +287,6 @@ 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);