From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Tony Lindgren <tony@atomide.com>,
maemo-leste@lists.dyne.org, Merlijn Wajer <merlijn@wizzup.org>,
Pavel Machek <pavel@ucw.cz>, Sebastian Reichel <sre@kernel.org>,
Sasha Levin <sashal@kernel.org>,
devicetree@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 01/17] ARM: dts: omap4-droid4: Fix spi configuration and increase rate
Date: Wed, 1 Jul 2020 21:26:33 -0400 [thread overview]
Message-ID: <20200702012649.2701799-1-sashal@kernel.org> (raw)
From: Tony Lindgren <tony@atomide.com>
[ Upstream commit 0df12a01f4857495816b05f048c4c31439446e35 ]
We can currently sometimes get "RXS timed out" errors and "EOT timed out"
errors with spi transfers.
These errors can be made easy to reproduce by reading the cpcap iio
values in a loop while keeping the CPUs busy by also reading /dev/urandom.
The "RXS timed out" errors we can fix by adding spi-cpol and spi-cpha
in addition to the spi-cs-high property we already have.
The "EOT timed out" errors we can fix by increasing the spi clock rate
to 9.6 MHz. Looks similar MC13783 PMIC says it works at spi clock rates
up to 20 MHz, so let's assume we can pick any rate up to 20 MHz also
for cpcap.
Cc: maemo-leste@lists.dyne.org
Cc: Merlijn Wajer <merlijn@wizzup.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi b/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi
index bcced922b2807..b4779b0ece96d 100644
--- a/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi
+++ b/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi
@@ -16,8 +16,10 @@ cpcap: pmic@0 {
#interrupt-cells = <2>;
#address-cells = <1>;
#size-cells = <0>;
- spi-max-frequency = <3000000>;
+ spi-max-frequency = <9600000>;
spi-cs-high;
+ spi-cpol;
+ spi-cpha;
cpcap_adc: adc {
compatible = "motorola,mapphone-cpcap-adc";
--
2.25.1
next reply other threads:[~2020-07-02 1:27 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-02 1:26 Sasha Levin [this message]
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 02/17] gpu: host1x: Detach driver on unregister Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 03/17] net: usb: ax88179_178a: fix packet alignment padding Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 04/17] usb: usbtest: fix missing kfree(dev->buf) in usbtest_disconnect Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 05/17] spi: spidev: fix a race between spidev_release and spidev_remove Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 06/17] spi: spidev: fix a potential use-after-free in spidev_release() Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 07/17] tg3: driver sleeps indefinitely when EEH errors exceed eeh_max_freezes Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 08/17] ixgbe: protect ring accesses with READ- and WRITE_ONCE Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 09/17] usbnet: smsc95xx: Fix use-after-free after removal Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 10/17] s390/kasan: fix early pgm check handler execution Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 11/17] cifs: Fix double add page to memcg when cifs_readpages Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 12/17] cifs: update ctime and mtime during truncate Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 13/17] ARM: imx6: add missing put_device() call in imx6q_suspend_init() Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 14/17] scsi: mptscsih: Fix read sense data size Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 15/17] nvme-rdma: assign completion vector correctly Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 16/17] x86/entry: Increase entry_stack size to a full page Sasha Levin
2020-07-02 1:26 ` [PATCH AUTOSEL 4.14 17/17] kgdb: Avoid suspicious RCU usage warning Sasha Levin
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