From: Kevin Liu <kevinliu@asrmicro.com>
Date: Wed, 8 Mar 2017 07:16:44 +0000 (+0800)
Subject: mmc: sdhci: only flush cache for data command
X-Git-Tag: v2017.05-rc1~19^2~2
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=fa7720b21ef48f2d0ebd22f609fea7ec2cfe6c16;p=u-boot

mmc: sdhci: only flush cache for data command

No need to flush cache for command without data.

Signed-off-by: Kevin Liu <kevinliu@asrmicro.com>
---

diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 93cefd89cd..c94d58db65 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -242,8 +242,10 @@ static int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
 
 	sdhci_writel(host, cmd->cmdarg, SDHCI_ARGUMENT);
 #ifdef CONFIG_MMC_SDHCI_SDMA
-	trans_bytes = ALIGN(trans_bytes, CONFIG_SYS_CACHELINE_SIZE);
-	flush_cache(start_addr, trans_bytes);
+	if (data != 0) {
+		trans_bytes = ALIGN(trans_bytes, CONFIG_SYS_CACHELINE_SIZE);
+		flush_cache(start_addr, trans_bytes);
+	}
 #endif
 	sdhci_writew(host, SDHCI_MAKE_CMD(cmd->cmdidx, flags), SDHCI_COMMAND);
 	start = get_timer(0);