From: Chanwoo Choi <cwchoi00@gmail.com>
To: "Heiko Stübner" <heiko@sntech.de>,
"Brian Norris" <briannorris@chromium.org>,
"MyungJoo Ham" <myungjoo.ham@samsung.com>,
"Kyungmin Park" <kyungmin.park@samsung.com>,
"Chanwoo Choi" <cw00.choi@samsung.com>
Cc: linux-kernel@vger.kernel.org,
Elaine Zhang <zhangqing@rock-chips.com>,
linux-pm@vger.kernel.org, Doug Anderson <dianders@chromium.org>,
linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org
Subject: Re: [RFC PATCH 2/2] PM / devfreq: rk3399_dmc: Block PMU during transitions
Date: Sat, 7 May 2022 23:21:59 +0900 [thread overview]
Message-ID: <6c6ec0db-111c-e48f-57ce-0e444a0d168e@gmail.com> (raw)
In-Reply-To: <582e3645-b24e-356e-7f0f-0d37bb1e32e6@gmail.com>
On 22. 4. 14. 08:13, Chanwoo Choi wrote:
> On 22. 4. 14. 07:45, Heiko Stübner wrote:
>> Hi,
>>
>> Am Donnerstag, 14. April 2022, 00:14:40 CEST schrieb Chanwoo Choi:
>>> On 22. 4. 6. 10:48, Brian Norris wrote:
>>>> See the previous patch ("soc: rockchip: power-domain: Manage resource
>>>> conflicts with firmware") for a thorough explanation of the conflicts.
>>>> While ARM Trusted Firmware may be modifying memory controller and
>>>> power-domain states, we need to block the kernel's power-domain driver.
>>>>
>>>> If the power-domain driver is disabled, there is no resource conflict
>>>> and this becomes a no-op.
>>>>
>>>> Signed-off-by: Brian Norris <briannorris@chromium.org>
>>>> ---
>>>>
>>>> drivers/devfreq/rk3399_dmc.c | 13 +++++++++++++
>>>> 1 file changed, 13 insertions(+)
>>>>
>>>> diff --git a/drivers/devfreq/rk3399_dmc.c
>>>> b/drivers/devfreq/rk3399_dmc.c
>>>> index e494d1497d60..daff40702615 100644
>>>> --- a/drivers/devfreq/rk3399_dmc.c
>>>> +++ b/drivers/devfreq/rk3399_dmc.c
>>>> @@ -21,6 +21,7 @@
>>>> #include <linux/rwsem.h>
>>>> #include <linux/suspend.h>
>>>> +#include <soc/rockchip/pm_domains.h>
>>>> #include <soc/rockchip/rk3399_grf.h>
>>>> #include <soc/rockchip/rockchip_sip.h>
>>>> @@ -93,6 +94,16 @@ static int rk3399_dmcfreq_target(struct device
>>>> *dev, unsigned long *freq,
>>>> mutex_lock(&dmcfreq->lock);
>>>> + /*
>>>> + * Ensure power-domain transitions don't interfere with ARM
>>>> Trusted
>>>> + * Firmware power-domain idling.
>>>> + */
>>>> + err = rockchip_pmu_block();
>>>> + if (err) {
>>>> + dev_err(dev, "Failed to block PMU: %d\n", err);
>>>> + goto out_unlock;
>>>> + }
>>>> +
>>>> /*
>>>> * Some idle parameters may be based on the DDR controller
>>>> clock, which
>>>> * is half of the DDR frequency.
>>>> @@ -198,6 +209,8 @@ static int rk3399_dmcfreq_target(struct device
>>>> *dev, unsigned long *freq,
>>>> dmcfreq->volt = target_volt;
>>>> out:
>>>> + rockchip_pmu_unblock();
>>>> +out_unlock:
>>>> mutex_unlock(&dmcfreq->lock);
>>>> return err;
>>>> }
>>>
>>> Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
>>
>> so I guess you're ok with me picking up both patches, right?
>> [Just making sure :-) ]
>
> This patch have the dependency of latest devfreq-next branch.
> So that need to make the immutable branch between rockchip and devfreq.
>
Hi Heiko and Brian,
Is there any other progress?
IMHO, if rockchip maintainer reply the acked-by from patch1
and then agree these patches to be applied to devfreq.git,
I can take them.
--
Best Regards,
Samsung Electronics
Chanwoo Choi
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
next prev parent reply other threads:[~2022-05-07 14:22 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-06 1:48 [RFC PATCH 0/2] rockchip / devfreq: Coordinate DRAM controller resources between ATF and kernel Brian Norris
2022-04-06 1:48 ` [RFC PATCH 1/2] soc: rockchip: power-domain: Manage resource conflicts with firmware Brian Norris
2022-04-06 2:26 ` Doug Anderson
2022-04-07 5:04 ` Chanwoo Choi
2022-04-09 3:34 ` Brian Norris
2022-04-12 16:01 ` Peter Geis
2022-04-13 22:14 ` Chanwoo Choi
2022-05-08 15:05 ` Heiko Stuebner
2022-04-06 1:48 ` [RFC PATCH 2/2] PM / devfreq: rk3399_dmc: Block PMU during transitions Brian Norris
2022-04-06 2:26 ` Doug Anderson
2022-04-13 22:14 ` Chanwoo Choi
2022-04-13 22:45 ` Heiko Stübner
2022-04-13 23:13 ` Chanwoo Choi
2022-05-07 14:21 ` Chanwoo Choi [this message]
2022-05-08 15:07 ` Heiko Stuebner
2022-05-08 18:42 ` Chanwoo Choi
2022-05-08 18:40 ` [RFC PATCH 0/2] rockchip / devfreq: Coordinate DRAM controller resources between ATF and kernel Chanwoo Choi
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