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);