redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity

mmc: sdhci-of-arasan: fix set_clock when a phy is supported

Browse source 
commit 61b914eb81f8 ("mmc: sdhci-of-arasan: add phy support for
sdhci-of-arasan") introduce phy support for arasan. According to
the vendor's databook, we should make sure the phy is in poweroff
status before we configure the clk stuff. Otherwise it may cause
some IO sample timing issues from the test. And we don't need this
extra operation while running in low performance mode since phy
doesn't trigger sampling block.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Shawn Lin 2016-05-04 09:43:24 +08:00 committed by Ulf Hansson
parent d15b08fb22
commit 802ac39a55
1 changed files with 25 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

26
drivers/mmc/host/sdhci-of-arasan.c
View file

@ -55,8 +55,32 @@ static unsigned int sdhci_arasan_get_timeout_clock(struct sdhci_host *host)
return freq;
}
static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
bool ctrl_phy = false;
if (clock > MMC_HIGH_52_MAX_DTR && (!IS_ERR(sdhci_arasan->phy)))
ctrl_phy = true;
if (ctrl_phy) {
spin_unlock_irq(&host->lock);
phy_power_off(sdhci_arasan->phy);
spin_lock_irq(&host->lock);
}
sdhci_set_clock(host, clock);
if (ctrl_phy) {
spin_unlock_irq(&host->lock);
phy_power_on(sdhci_arasan->phy);
spin_lock_irq(&host->lock);
}
}
static struct sdhci_ops sdhci_arasan_ops = {
.set_clock = sdhci_set_clock,
.set_clock = sdhci_arasan_set_clock,
.get_max_clock = sdhci_pltfm_clk_get_max_clock,
.get_timeout_clock = sdhci_arasan_get_timeout_clock,
.set_bus_width = sdhci_set_bus_width,