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mmc: mediatek: fix CRC error when calling mmc_select_hs400() 

the tune result of hs200 mode at 200Mhz is not suitable for 50Mhz,
mmc_select_hs400() will set clock frequency to 50Mhz, use defalut
tune setting for 50Mhz to avoid CRC error.

Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Chaotian Jing 2016-06-30 10:00:59 +08:00 committed by Ulf Hansson
parent 5462ff39c4
commit 86beac3704
1 changed files with 23 additions and 0 deletions
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23
drivers/mmc/host/mtk-sd.c
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@ -287,6 +287,11 @@ struct msdc_save_para {
u32 emmc50_cfg0;
};
struct msdc_tune_para {
u32 iocon;
u32 pad_tune;
};
struct msdc_delay_phase {
u8 maxlen;
u8 start;
@ -328,6 +333,8 @@ struct msdc_host {
u32 hs400_ds_delay;
bool hs400_mode; /* current eMMC will run at hs400 mode */
struct msdc_save_para save_para; /* used when gate HCLK */
struct msdc_tune_para def_tune_para; /* default tune setting */
struct msdc_tune_para saved_tune_para; /* tune result of CMD21/CMD19 */
};
static void sdr_set_bits(void __iomem *reg, u32 bs)
@ -583,6 +590,18 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
msdc_set_timeout(host, host->timeout_ns, host->timeout_clks);
sdr_set_bits(host->base + MSDC_INTEN, flags);
/*
* mmc_select_hs400() will drop to 50Mhz and High speed mode,
* tune result of hs200/200Mhz is not suitable for 50Mhz
*/
if (host->sclk <= 52000000) {
writel(host->def_tune_para.iocon, host->base + MSDC_IOCON);
writel(host->def_tune_para.pad_tune, host->base + MSDC_PAD_TUNE);
} else {
writel(host->saved_tune_para.iocon, host->base + MSDC_IOCON);
writel(host->saved_tune_para.pad_tune, host->base + MSDC_PAD_TUNE);
}
dev_dbg(host->dev, "sclk: %d, timing: %d\n", host->sclk, timing);
}
@ -1159,6 +1178,8 @@ static void msdc_init_hw(struct msdc_host *host)
/* Configure to default data timeout */
sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, 3);
host->def_tune_para.iocon = readl(host->base + MSDC_IOCON);
host->def_tune_para.pad_tune = readl(host->base + MSDC_PAD_TUNE);
dev_dbg(host->dev, "init hardware done!");
}
@ -1409,6 +1430,8 @@ static int msdc_execute_tuning(struct mmc_host *mmc, u32 opcode)
dev_err(host->dev, "Tune data fail!\n");
}
host->saved_tune_para.iocon = readl(host->base + MSDC_IOCON);
host->saved_tune_para.pad_tune = readl(host->base + MSDC_PAD_TUNE);
return ret;
}