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mmc: host: rk_sdmmc: fix IP bug for div larger than 1

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This commit is contained in:
lintao
2014-05-15 18:21:52 +08:00
parent f8bb89bc7d
commit d00e874ad8
1 changed files with 14 additions and 0 deletions
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14
drivers/mmc/host/rk_sdmmc.c
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@@ -906,6 +906,20 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
mci_send_cmd(slot,
SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT, 0);
if(div > 1){
if((host->mmc->restrict_caps & RESTRICT_CARD_TYPE_EMMC)
&& clock > 100000000){
printk("rk_sdmmc: emmc : div larger than 1, illegal clk in dts ![%s]\n ",
mmc_hostname(host->mmc));
printk("eMMC ERROR, emergancy halt!!!!!!!!!\n");
printk("Please refer to your eMMC datasheet to determine speed mode!\n");
printk("DDR mode: clk in dts should <= 50MHz!\n");
printk("SDR mode: clk in dts should <= 50MHz!\n");
printk("HS200 mode: clk in dts should <= 150MHz!\n");
BUG();
}
}
/* set clock to desired speed */
mci_writel(host, CLKDIV, div);