[PATCH v3 1/3] mmc: sdhci: introduce sdhci_compute_clock_config

[Ludovic Desroches]

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 <ludovic.desroc...@atmel.com>
---
 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 6bd3d17..abd34d1 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1091,23 +1091,14 @@ 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;
@@ -1184,10 +1175,31 @@ 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 0f39f4f..9db5090 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);
-- 
2.5.0