From: lintao <lintao@rock-chips.com>
Date: Thu, 15 May 2014 10:21:52 +0000 (+0800)
Subject: mmc: host: rk_sdmmc: fix IP bug for div larger than 1
X-Git-Tag: firefly_0821_release~5270
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d00e874ad882435d700bfa61d22087d7812e2c25;p=firefly-linux-kernel-4.4.55.git
mmc: host: rk_sdmmc: fix IP bug for div larger than 1
---
diff --git a/drivers/mmc/host/rk_sdmmc.c b/drivers/mmc/host/rk_sdmmc.c
index 2fe9f14997df..747941668bac 100755
--- a/drivers/mmc/host/rk_sdmmc.c
+++ b/drivers/mmc/host/rk_sdmmc.c
@@ -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);