From: Anand Moon <linux.amoon@gmail.com>
To: Krzysztof Kozlowski <krzk@kernel.org>
Cc: linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-samsung-soc@vger.kernel.org,
Linux Kernel <linux-kernel@vger.kernel.org>,
Kishon Vijay Abraham I <kishon@ti.com>,
Vinod Koul <vkoul@kernel.org>, Kukjin Kim <kgene@kernel.org>,
Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [PATCH v2] phy: samsung: Use readl_poll_timeout function
Date: Mon, 6 Jul 2020 09:17:09 +0530 [thread overview]
Message-ID: <CANAwSgQzQuP5i8ZkvxHS===oVO2y-ZWZZRt9CyRtq1AiyrL81w@mail.gmail.com> (raw)
In-Reply-To: <20200705180248.GA2765@kozik-lap>
Hi Krzysztof,
Thanks for your review comments.
On Sun, 5 Jul 2020 at 23:32, Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> On Sun, Jul 05, 2020 at 06:04:35AM +0000, Anand Moon wrote:
> > User readl_poll_timeout function instead of open
> > coded handling in crport_handshake function.
>
> Your change does not replace only the "open coded handling" with
> readl_poll_timeout(). Your change does more - switches busy waiting with
> udelay to a sleeping mode. I am not sure if it is correct but definitly
> it should be mentioned. Otherwise how can we be sure that you checked
> if this is allowed in this section? Did you test everything with
> DEBUG_ATOMIC_SLEEP?
Yes this DEBUG_ATOMIC_SLEEP is enabled in exynos_defconfig.
>
Ok how about the below commit message.
Instead of a busy waiting loop while loop using udelay use readl_poll_timeout
function to check the condition is met or timeout occurs in
crport_handshake function.
> >
> > Fixes: d8c80bb3b55b ("phy: exynos5-usbdrd: Calibrate LOS levels for exynos5420/5800")
> > Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> > ---
> > Changes v2:
> > --used the default timeout values.
> > --Added missing Fixed tags.
> > ---
> > drivers/phy/samsung/phy-exynos5-usbdrd.c | 37 +++++++++---------------
> > 1 file changed, 13 insertions(+), 24 deletions(-)
> >
> > diff --git a/drivers/phy/samsung/phy-exynos5-usbdrd.c b/drivers/phy/samsung/phy-exynos5-usbdrd.c
> > index e510732afb8b..c97f5fb6a9a0 100644
> > --- a/drivers/phy/samsung/phy-exynos5-usbdrd.c
> > +++ b/drivers/phy/samsung/phy-exynos5-usbdrd.c
> > @@ -16,6 +16,7 @@
> > #include <linux/of.h>
> > #include <linux/of_address.h>
> > #include <linux/of_device.h>
> > +#include <linux/iopoll.h>
> > #include <linux/phy/phy.h>
> > #include <linux/platform_device.h>
> > #include <linux/mutex.h>
> > @@ -556,40 +557,28 @@ static int exynos5_usbdrd_phy_power_off(struct phy *phy)
> > static int crport_handshake(struct exynos5_usbdrd_phy *phy_drd,
> > u32 val, u32 cmd)
> > {
> > - u32 usec = 100;
> > + u32 timeout_us = 100, sleep_us = 1;
>
> No need for the variables actually and their type does not match. Just
> use the values directly.
Ok thanks
>
> > unsigned int result;
> > + int err;
> >
> > writel(val | cmd, phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0);
> >
> > - do {
> > - result = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1);
> > - if (result & PHYREG1_CR_ACK)
> > - break;
> > -
> > - udelay(1);
> > - } while (usec-- > 0);
> > -
> > - if (!usec) {
> > - dev_err(phy_drd->dev,
> > - "CRPORT handshake timeout1 (0x%08x)\n", val);
> > + err = readl_poll_timeout(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1,
> > + result, (result & PHYREG1_CR_ACK), sleep_us, timeout_us);
> > + if (err) {
> > + dev_err(phy_drd->dev, "CRPORT handshake timeout1 (0x%08x)\n", val);
> > return -ETIME;
> > }
> >
> > - usec = 100;
> > + timeout_us = 100;
> > + sleep_us = 1;
>
> Why defining then again?
I had removed this in this but last minute I added this code again.
>
> Best regards,
> Krzysztof
>
Best Regards
-Anand
prev parent reply other threads:[~2020-07-06 3:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-05 6:04 [PATCH v2] phy: samsung: Use readl_poll_timeout function Anand Moon
2020-07-05 18:02 ` Krzysztof Kozlowski
2020-07-06 3:47 ` Anand Moon [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CANAwSgQzQuP5i8ZkvxHS===oVO2y-ZWZZRt9CyRtq1AiyrL81w@mail.gmail.com' \
--to=linux.amoon@gmail.com \
--cc=kgene@kernel.org \
--cc=kishon@ti.com \
--cc=krzk@kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-samsung-soc@vger.kernel.org \
--cc=m.szyprowski@samsung.com \
--cc=vkoul@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).