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mmc: tmio: stop clock when 0Hz is requested

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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.

Because we now do the 'new_clock == 0' check right at the beginning,
the indentation level of the rest of the code can be decreased a little.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Wolfram Sang 2016-04-01 17:44:35 +02:00 committed by Ulf Hansson
parent 7fbc030da8
commit 148634d24d
1 changed files with 27 additions and 25 deletions
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52
drivers/mmc/host/tmio_mmc_pio.c
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@ -166,26 +166,40 @@ 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;
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 (new_clock == 0) {
tmio_mmc_clk_stop(host);
return;
}
if (host->clk_update)
clock = host->clk_update(host, new_clock) / 512;
else
clock = host->mmc->f_min;
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 */