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[8/9] mmc: tmio: disable clock before changing it

Message ID 1453749316-1848-9-git-send-email-wsa@the-dreams.de (mailing list archive)
State Superseded
Delegated to: Geert Uytterhoeven
Headers show

Commit Message

Wolfram Sang Jan. 25, 2016, 7:15 p.m. UTC 
From: Wolfram Sang <wsa+renesas@sang-engineering.com>

Rcar2 & 3 docs state that for going to and coming from the 0xff setting,
the clock must first be disabled before the DIV bits are changed.
Instead of tracking this, let's just do this unconditionally.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 drivers/mmc/host/tmio_mmc_pio.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index 7f6b5adf12094b..03f6e74c190691 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -174,6 +174,8 @@  static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
 	if (host->set_clk_div)
 		host->set_clk_div(host->pdev, (clk >> 22) & 1);
 
+	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
+			sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
 	sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
 	if (!(host->pdata->flags & TMIO_MMC_FAST_CLK_CHG))
 		msleep(10);