From 327713a64a4dd71758c44ba9b86cab5c5379274f Mon Sep 17 00:00:00 2001 From: Ludovic Desroches Date: Fri, 17 Nov 2017 14:51:27 +0800 Subject: [PATCH] mmc: atmel_sdhci: not on capabilities to set gck rate The capabilities have default values which doesn't reflect the reality when it concerns the base clock and the mul value. Use a fixe rate for the gck. 240 MHz is an arbitrary choice, it is a multiple of the maximum SD clock frequency handle by the controller and it allows to get a 400 kHz clock for the card initialisation. Signed-off-by: Ludovic Desroches Signed-off-by: Wenyou Yang --- drivers/mmc/atmel_sdhci.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/drivers/mmc/atmel_sdhci.c b/drivers/mmc/atmel_sdhci.c index c19a1f36b6..9b37e32c8d 100644 --- a/drivers/mmc/atmel_sdhci.c +++ b/drivers/mmc/atmel_sdhci.c @@ -13,6 +13,7 @@ #include #define ATMEL_SDHC_MIN_FREQ 400000 +#define ATMEL_SDHC_GCK_RATE 240000000 #ifndef CONFIG_DM_MMC int atmel_sdhci_init(void *regbase, u32 id) @@ -57,9 +58,6 @@ static int atmel_sdhci_probe(struct udevice *dev) struct atmel_sdhci_plat *plat = dev_get_platdata(dev); struct sdhci_host *host = dev_get_priv(dev); u32 max_clk; - u32 caps, caps_1; - u32 clk_base, clk_mul; - ulong gck_rate; struct clk clk; int ret; @@ -78,17 +76,11 @@ static int atmel_sdhci_probe(struct udevice *dev) host->bus_width = fdtdec_get_int(gd->fdt_blob, dev_of_offset(dev), "bus-width", 4); - caps = sdhci_readl(host, SDHCI_CAPABILITIES); - clk_base = (caps & SDHCI_CLOCK_V3_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT; - caps_1 = sdhci_readl(host, SDHCI_CAPABILITIES_1); - clk_mul = (caps_1 & SDHCI_CLOCK_MUL_MASK) >> SDHCI_CLOCK_MUL_SHIFT; - gck_rate = clk_base * 1000000 * (clk_mul + 1); - ret = clk_get_by_index(dev, 1, &clk); if (ret) return ret; - ret = clk_set_rate(&clk, gck_rate); + ret = clk_set_rate(&clk, ATMEL_SDHC_GCK_RATE); if (ret) return ret; -- 2.39.5