[RFC PATCH 04/18] mmc: msm: move clk-reset logic to platform
From: Ulf Hansson <hidden>
Date: 2015-03-13 13:15:46
Also in:
linux-arm-msm, lkml
On 4 March 2015 at 20:32, Arnd Bergmann [off-list ref] wrote:
There is no generic interface for resetting a clock, and creating a reset driver for msm seems overkill, so this moves the reset logic from the msm_sdcc driver into a platform_data callback that calls into the clock driver. This follows the model that is used for all other devices on the msm platform that require a clk reset. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Ulf Hansson <redacted>
quoted hunk ↗ jump to hunk
--- arch/arm/mach-msm/board-qsd8x50.c | 18 +++++++++++++++++- arch/arm/mach-msm/board-trout-mmc.c | 18 ++++++++++++++++++ arch/arm/mach-msm/clock.c | 2 +- drivers/mmc/host/msm_sdcc.c | 12 ++---------- include/linux/platform_data/mmc-msm_sdcc.h | 3 +++ 5 files changed, 41 insertions(+), 12 deletions(-)diff --git a/arch/arm/mach-msm/board-qsd8x50.c b/arch/arm/mach-msm/board-qsd8x50.c index 4c748616ef47..9676a73683d2 100644 --- a/arch/arm/mach-msm/board-qsd8x50.c +++ b/arch/arm/mach-msm/board-qsd8x50.c@@ -180,6 +180,21 @@ static uint32_t msm_sdcc_setup_power(struct device *dv, unsigned int vdd) return 0; } +static void msm_sdcc_clk_reset(struct clk *clk) +{ + int ret; + + ret = clk_reset(clk, CLK_RESET_ASSERT); + if (ret) + pr_err("sdcc clock assert failed at %lu Hz with err %d\n", + clk_get_rate(clk), ret); + + ret = clk_reset(clk, CLK_RESET_DEASSERT); + if (ret) + pr_err("sdcc clock deassert failed at %lu Hz with err %d\n", + clk_get_rate(clk), ret); +} + static struct msm_mmc_gpio_data sdc1_gpio = { .gpio = sdc1_gpio_cfg, .size = ARRAY_SIZE(sdc1_gpio_cfg),@@ -188,7 +203,8 @@ static struct msm_mmc_gpio_data sdc1_gpio = { static struct msm_mmc_platform_data qsd8x50_sdc1_data = { .ocr_mask = MMC_VDD_27_28 | MMC_VDD_28_29, .translate_vdd = msm_sdcc_setup_power, - .gpio_data = &sdc1_gpio, + .gpio_data = &sdc1_gpio, + .clk_reset = msm_sdcc_clk_reset, }; static void __init qsd8x50_init_mmc(void)diff --git a/arch/arm/mach-msm/board-trout-mmc.c b/arch/arm/mach-msm/board-trout-mmc.c index 3723e55819d6..2474bba71c8b 100644 --- a/arch/arm/mach-msm/board-trout-mmc.c +++ b/arch/arm/mach-msm/board-trout-mmc.c@@ -2,6 +2,7 @@ ** Author: Brian Swetland <swetland@google.com> */ #include <linux/gpio.h> +#include <linux/clk.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/platform_device.h>@@ -14,6 +15,7 @@ #include <asm/io.h> #include <mach/vreg.h> +#include <mach/clk.h> #include <linux/platform_data/mmc-msm_sdcc.h>@@ -154,6 +156,21 @@ static unsigned int trout_sdslot_status(struct device *dev) return (!status); } +static void trout_sdcc_clk_reset(struct clk *clk) +{ + int ret; + + ret = clk_reset(clk, CLK_RESET_ASSERT); + if (ret) + pr_err("sdcc clock assert failed at %lu Hz with err %d\n", + clk_get_rate(clk), ret); + + ret = clk_reset(clk, CLK_RESET_DEASSERT); + if (ret) + pr_err("sdcc clock deassert failed at %lu Hz with err %d\n", + clk_get_rate(clk), ret); +} + #define TROUT_MMC_VDD MMC_VDD_165_195 | MMC_VDD_20_21 | MMC_VDD_21_22 \ | MMC_VDD_22_23 | MMC_VDD_23_24 | MMC_VDD_24_25 \ | MMC_VDD_25_26 | MMC_VDD_26_27 | MMC_VDD_27_28 \@@ -163,6 +180,7 @@ static struct msm_mmc_platform_data trout_sdslot_data = { .ocr_mask = TROUT_MMC_VDD, .status = trout_sdslot_status, .translate_vdd = trout_sdslot_switchvdd, + .clk_reset = trout_sdcc_clk_reset, }; int __init trout_init_mmc(unsigned int sys_rev)diff --git a/arch/arm/mach-msm/clock.c b/arch/arm/mach-msm/clock.c index 35ea02b52483..0b59ad5eb557 100644 --- a/arch/arm/mach-msm/clock.c +++ b/arch/arm/mach-msm/clock.c@@ -23,6 +23,6 @@ int clk_reset(struct clk *clk, enum clk_reset_action action) { struct clk_hw *hw = __clk_get_hw(clk); struct msm_clk *m = to_msm_clk(hw); + return m->reset(hw, action); } -EXPORT_SYMBOL(clk_reset);diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c index 3002e377e9f7..be5b9b3b3843 100644 --- a/drivers/mmc/host/msm_sdcc.c +++ b/drivers/mmc/host/msm_sdcc.c@@ -45,7 +45,6 @@ #include <asm/sizes.h> #include <linux/platform_data/mmc-msm_sdcc.h> -#include <mach/clk.h> /* data mover definitions */@@ -493,15 +492,8 @@ static void msmsdcc_reset_and_restore(struct msmsdcc_host *host) mci_mask0 = readl(host->base + MMCIMASK0); /* Reset the controller */ - ret = clk_reset(host->clk, CLK_RESET_ASSERT); - if (ret) - pr_err("%s: Clock assert failed at %u Hz with err %d\n", - mmc_hostname(host->mmc), host->clk_rate, ret); - - ret = clk_reset(host->clk, CLK_RESET_DEASSERT); - if (ret) - pr_err("%s: Clock deassert failed at %u Hz with err %d\n", - mmc_hostname(host->mmc), host->clk_rate, ret); + if (host->plat->clk_reset) + host->plat->clk_reset(host->clk); pr_info("%s: Controller has been re-initialiazed\n", mmc_hostname(host->mmc));diff --git a/include/linux/platform_data/mmc-msm_sdcc.h b/include/linux/platform_data/mmc-msm_sdcc.h index 55aa873c9396..6f1821a4bf93 100644 --- a/include/linux/platform_data/mmc-msm_sdcc.h +++ b/include/linux/platform_data/mmc-msm_sdcc.h@@ -15,6 +15,8 @@ struct msm_mmc_gpio_data { u8 size; }; +struct clk; + struct msm_mmc_platform_data { unsigned int ocr_mask; /* available voltages */ u32 (*translate_vdd)(struct device *, unsigned int);@@ -22,6 +24,7 @@ struct msm_mmc_platform_data { int (*register_status_notify)(void (*callback)(int card_present, void *dev_id), void *dev_id); struct msm_mmc_gpio_data *gpio_data; void (*init_card)(struct mmc_card *card); + void (*clk_reset)(struct clk *clk); }; #endif --2.1.0.rc2