From fb9ee04779cf34a10ef7afaabf4e8055688777c4 Mon Sep 17 00:00:00 2001 From: Ludovic Desroches Date: Thu, 7 Apr 2016 11:13:08 +0200 Subject: [PATCH] mmc: sdhci: Introduce sdhci_calc_clk() In order to remove the SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST and to reduce code duplication, put the code relative to the SD clock configuration in a function which can be used by hosts for the implementation of the ->set_clock() callback. Signed-off-by: Ludovic Desroches Acked-by: Adrian Hunter Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci.c | 36 ++++++++++++++++++++++++------------ drivers/mmc/host/sdhci.h | 2 ++ 2 files changed, 26 insertions(+), 12 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index c6dbe65ada20..aaf535ad3a4f 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1085,23 +1085,14 @@ static u16 sdhci_get_preset_value(struct sdhci_host *host) return preset; } -void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) +u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock, + unsigned int *actual_clock) { int div = 0; /* Initialized for compiler warning */ int real_div = div, clk_mul = 1; u16 clk = 0; - unsigned long timeout; bool switch_base_clk = false; - host->mmc->actual_clock = 0; - - sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL); - if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST) - mdelay(1); - - if (clock == 0) - return; - if (host->version >= SDHCI_SPEC_300) { if (host->preset_enabled) { u16 pre_val; @@ -1178,10 +1169,31 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) clock_set: if (real_div) - host->mmc->actual_clock = (host->max_clk * clk_mul) / real_div; + *actual_clock = (host->max_clk * clk_mul) / real_div; clk |= (div & SDHCI_DIV_MASK) << SDHCI_DIVIDER_SHIFT; clk |= ((div & SDHCI_DIV_HI_MASK) >> SDHCI_DIV_MASK_LEN) << SDHCI_DIVIDER_HI_SHIFT; + + return clk; +} +EXPORT_SYMBOL_GPL(sdhci_calc_clk); + +void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) +{ + u16 clk; + unsigned long timeout; + + host->mmc->actual_clock = 0; + + sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL); + if (host->quirks2 & SDHCI_QUIRK2_NEED_DELAY_AFTER_INT_CLK_RST) + mdelay(1); + + if (clock == 0) + return; + + clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock); + clk |= SDHCI_CLOCK_INT_EN; sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL); diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 0f39f4f84d10..9db5090161d8 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -661,6 +661,8 @@ static inline bool sdhci_sdio_irq_enabled(struct sdhci_host *host) return !!(host->flags & SDHCI_SDIO_IRQ_ENABLED); } +u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock, + unsigned int *actual_clock); void sdhci_set_clock(struct sdhci_host *host, unsigned int clock); void sdhci_set_power(struct sdhci_host *host, unsigned char mode, unsigned short vdd); -- 2.20.1