From: Felipe Balbi <balbi@kernel.org>
To: Vicente Bergas <vicencb@gmail.com>, Robin Murphy <robin.murphy@arm.com>
Cc: Matthias Brugger <mbrugger@suse.com>,
Heiko Stuebner <heiko@sntech.de>,
Marc Zyngier <marc.zyngier@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-usb@vger.kernel.org, Will Deacon <will.deacon@arm.com>,
linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: kexec on rk3399
Date: Thu, 15 Aug 2019 09:06:02 +0300 [thread overview]
Message-ID: <87pnl7t12t.fsf@gmail.com> (raw)
In-Reply-To: <59055782-7fc2-4b16-af8b-a56fb845a43f@gmail.com>
Hi,
Vicente Bergas <vicencb@gmail.com> writes:
> On Wednesday, August 14, 2019 3:12:26 PM CEST, Robin Murphy wrote:
>> On 14/08/2019 13:53, Vicente Bergas wrote:
>>> On Monday, July 22, 2019 4:31:27 PM CEST, Vicente Bergas wrote: ...
>>
>> This particular change looks like it's implicitly specific to
>> RK3399, which wouldn't be ideal. Presumably if the core dwc3
>> driver implemented shutdown correctly (echoing parts of
>> dwc3_remove(), I guess) then the glue layers shouldn't need
>> anything special anyway.
>>
>> Robin.
>
> I just checked simple->resets from dwc3-of-simple.c and it is an array
> with multiple resets whereas dwc->reset from core.c is NULL.
> So the reset seems specific to the glue layers.
> Is there another way than resetting the thing that is
> generic enough to go to core.c and allows kexec?
This is a really odd 'failure'. We do full soft reset during driver
initialization on dwc3. We shouldn't need to assert reset on shutdown,
really.
I think the problem is here:
if (simple->pulse_resets) {
ret = reset_control_reset(simple->resets);
if (ret)
goto err_resetc_put;
} else {
ret = reset_control_deassert(simple->resets);
if (ret)
goto err_resetc_put;
}
Note that if pulse_resets is set, we will run a reset. But if
pulse_resets is false and need_reset is true, we deassert the reset.
I think below patch is enough:
diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
index bdac3e7d7b18..9a2f3e09aa2e 100644
--- a/drivers/usb/dwc3/dwc3-of-simple.c
+++ b/drivers/usb/dwc3/dwc3-of-simple.c
@@ -72,7 +72,15 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
ret = reset_control_reset(simple->resets);
if (ret)
goto err_resetc_put;
- } else {
+ }
+
+ if (simple->need_reset) {
+ ret = reset_control_assert(simple->resets);
+ if (ret)
+ goto err_resetc_put;
+
+ usleep_range(1000, 2000);
+
ret = reset_control_deassert(simple->resets);
if (ret)
goto err_resetc_put;
@@ -121,9 +129,6 @@ static int dwc3_of_simple_remove(struct platform_device *pdev)
clk_bulk_put_all(simple->num_clocks, simple->clks);
simple->num_clocks = 0;
- if (!simple->pulse_resets)
- reset_control_assert(simple->resets);
-
reset_control_put(simple->resets);
pm_runtime_disable(dev);
Can you test?
--
balbi
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next prev parent reply other threads:[~2019-08-15 6:06 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-22 14:31 kexec on rk3399 Vicente Bergas
2019-07-22 14:46 ` Will Deacon
2019-07-22 16:08 ` Vicente Bergas
2019-07-22 14:47 ` Matthias Brugger
2019-07-22 16:56 ` Vicente Bergas
2019-07-22 14:54 ` Marc Zyngier
2019-07-22 17:05 ` Vicente Bergas
2019-07-22 17:35 ` Robin Murphy
2019-07-22 18:53 ` Vicente Bergas
2019-07-23 13:32 ` Robin Murphy
2019-08-14 12:53 ` Vicente Bergas
2019-08-14 13:06 ` Felipe Balbi
2019-08-14 13:15 ` Vicente Bergas
2019-08-15 6:00 ` Felipe Balbi
2019-08-14 13:12 ` Robin Murphy
2019-08-15 1:15 ` Vicente Bergas
2019-08-15 6:06 ` Felipe Balbi [this message]
2019-08-15 11:09 ` Robin Murphy
2019-08-17 17:41 ` [PATCH] usb: dwc3: Add shutdown to platform_driver Vicente Bergas
2019-08-27 11:45 ` Vicente Bergas
2019-08-27 11:53 ` Felipe Balbi
2019-08-27 12:16 ` Vicente Bergas
2019-09-09 15:07 ` Vicente Bergas
2019-10-23 6:31 ` Felipe Balbi
2019-10-24 12:15 ` Vicente Bergas
2019-10-25 10:25 ` Felipe Balbi
2019-10-25 10:42 ` Vicente Bergas
2019-09-19 11:36 ` Vicente Bergas
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