From: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Setting frequency to 0 is not enough, the clock explicitly has to be
disabled. Otherwise voltage switching (which needs SDCLK to be quiet)
fails for various cards.
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
New patch, was not in RFC.
drivers/mmc/host/tmio_mmc_pio.c | 50 +++++++++++++++++++++--------------------
1 file changed, 26 insertions(+), 24 deletions(-)
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index e773969970e51b..8dee637638c31e 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -166,25 +166,39 @@ static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
}
}
+static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
+{
+ if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
+ sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
+ msleep(10);
+ }
+
+ sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
+ sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
+ msleep(host->pdata->flags & TMIO_MMC_FAST_CLK_CHG ? 5 : 10);
+}
+
static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
unsigned int new_clock)
{
u32 clk = 0, clock;
- if (new_clock) {
- if (host->clk_update)
- clock = host->clk_update(host, new_clock) / 512;
- else
- clock = host->mmc->f_min;
+ if (new_clock == 0) {
+ tmio_mmc_clk_stop(host);
+ return;
+ }
- for (clk = 0x80000080; new_clock >= (clock << 1); clk >>= 1)
- clock <<= 1;
+ if (host->clk_update)
+ clock = host->clk_update(host, new_clock) / 512;
+ else
+ clock = host->mmc->f_min;
- /* 1/1 clock is option */
- if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) &&
- ((clk >> 22) & 0x1))
- clk |= 0xff;
- }
+ for (clk = 0x80000080; new_clock >= (clock << 1); clk >>= 1)
+ clock <<= 1;
+
+ /* 1/1 clock is option */
+ if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) && ((clk >> 22) & 0x1))
+ clk |= 0xff;
if (host->set_clk_div)
host->set_clk_div(host->pdev, (clk >> 22) & 1);
@@ -198,18 +212,6 @@ static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
tmio_mmc_clk_start(host);
}
-static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
-{
- if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
- sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
- msleep(10);
- }
-
- sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
- sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
- msleep(host->pdata->flags & TMIO_MMC_FAST_CLK_CHG ? 5 : 10);
-}
-
static void tmio_mmc_reset(struct tmio_mmc_host *host)
{
/* FIXME - should we set stop clock reg here */
--
2.7.0
