在 2016/5/4 16:35, Heiko Stuebner 写道:
Am Mittwoch, 4. Mai 2016, 09:48:55 schrieb Shawn Lin:
在 2016/4/28 18:38, Ulf Hansson 写道:
On 28 April 2016 at 10:38, Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> wrote:
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@xxxxxxxxxxxxxx>
Thanks, applied for next!
Thanks for applying v2 but, could you please drop it and applied v3
I just send :) .
Because v2 introduces a bug. Set_clock callback will be
called under the protection of spinlock in sdhci_do_set_ios. However
PHY APIs need mutex which fails the kernel's debug check
BUG: sleeping function called from invalid context at
kernel/locking/mutex.c
I think in general you will need to provide a follow-up patch instead of
replacing the old version, as Ulf might not want to restructure an already
published branch (depends on the maintainer), especially as already other
stuff is on top of your patch [0].
Aha.. yes I see other patches on top of mine now. Thanks for reminding
it.
Ulf, would you mind that I send a new patch to fix it, or you are prone
to restructure the next?
Heiko
[0]
https://git.linaro.org/people/ulf.hansson/mmc.git/shortlog/refs/heads/next
Kind regards
Uffe
---
Changes in v2:
- change commit msg title to indicate it's a fix
- fix a typo in commmit msg
drivers/mmc/host/sdhci-of-arasan.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci-of-arasan.c
b/drivers/mmc/host/sdhci-of-arasan.c index 2e482b1..20b859e 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -55,8 +55,26 @@ 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)
+ phy_power_off(sdhci_arasan->phy);
+
+ sdhci_set_clock(host, clock);
+
+ if (ctrl_phy)
+ phy_power_on(sdhci_arasan->phy);
+}
+
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,
--
2.3.7
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--
Best Regards
Shawn Lin
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