From: Lukasz Luba <l.luba@partner.samsung.com> To: linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org Cc: tjakobi@math.uni-bielefeld.de, myungjoo.ham@samsung.com, kyungmin.park@samsung.com, cw00.choi@samsung.com, rjw@rjwysocki.net, len.brown@intel.com, pavel@ucw.cz, gregkh@linuxfoundation.org, keescook@chromium.org, anton@enomsg.org, ccross@android.com, tony.luck@intel.com, robh+dt@kernel.org, mark.rutland@arm.com, kgene@kernel.org, krzk@kernel.org, m.szyprowski@samsung.com, b.zolnierkie@samsung.com, Lukasz Luba <l.luba@partner.samsung.com> Subject: [PATCH 2/6] devfreq: refactor set_target frequency function Date: Wed, 21 Nov 2018 19:01:37 +0100 [thread overview] Message-ID: <1542823301-23563-3-git-send-email-l.luba@partner.samsung.com> (raw) In-Reply-To: <1542823301-23563-1-git-send-email-l.luba@partner.samsung.com> The refactoring is needed for the new client in devfreq: suspend. To avoid code duplication, move it to the new local function devfreq_set_target. The patch draws on Tobias Jakobi's work posted ~2 years ago, who tried to solve issue with devfreq device's frequency during suspend/resume. During the discussion on LKML some corner cases and comments appeared related to the design. This patch address them keeping in mind suggestions from Chanwoo Choi. Suggested-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> Suggested-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com> --- drivers/devfreq/devfreq.c | 62 ++++++++++++++++++++++++++++------------------- 1 file changed, 37 insertions(+), 25 deletions(-) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index e20e7e4..cf9c643 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -285,6 +285,42 @@ static int devfreq_notify_transition(struct devfreq *devfreq, return 0; } +static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq, + unsigned long *prev_freq, u32 flags) +{ + struct devfreq_freqs freqs; + unsigned long cur_freq; + int err = 0; + + if (devfreq->profile->get_cur_freq) + devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); + else + cur_freq = devfreq->previous_freq; + + freqs.old = cur_freq; + freqs.new = new_freq; + devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); + + err = devfreq->profile->target(devfreq->dev.parent, &new_freq, flags); + if (err) { + freqs.new = cur_freq; + devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); + return err; + } + + freqs.new = new_freq; + devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); + + if (devfreq_update_status(devfreq, new_freq)) + dev_err(&devfreq->dev, + "Couldn't update frequency transition information.\n"); + + devfreq->previous_freq = new_freq; + *prev_freq = cur_freq; + + return err; +} + /* Load monitoring helper functions for governors use */ /** @@ -296,7 +332,6 @@ static int devfreq_notify_transition(struct devfreq *devfreq, */ int update_devfreq(struct devfreq *devfreq) { - struct devfreq_freqs freqs; unsigned long freq, cur_freq, min_freq, max_freq; int err = 0; u32 flags = 0; @@ -333,31 +368,8 @@ int update_devfreq(struct devfreq *devfreq) flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */ } - if (devfreq->profile->get_cur_freq) - devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); - else - cur_freq = devfreq->previous_freq; - - freqs.old = cur_freq; - freqs.new = freq; - devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); + return devfreq_set_target(devfreq, freq, &cur_freq, flags); - err = devfreq->profile->target(devfreq->dev.parent, &freq, flags); - if (err) { - freqs.new = cur_freq; - devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); - return err; - } - - freqs.new = freq; - devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); - - if (devfreq_update_status(devfreq, freq)) - dev_err(&devfreq->dev, - "Couldn't update frequency transition information.\n"); - - devfreq->previous_freq = freq; - return err; } EXPORT_SYMBOL(update_devfreq); -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: l.luba@partner.samsung.com (Lukasz Luba) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 2/6] devfreq: refactor set_target frequency function Date: Wed, 21 Nov 2018 19:01:37 +0100 [thread overview] Message-ID: <1542823301-23563-3-git-send-email-l.luba@partner.samsung.com> (raw) In-Reply-To: <1542823301-23563-1-git-send-email-l.luba@partner.samsung.com> The refactoring is needed for the new client in devfreq: suspend. To avoid code duplication, move it to the new local function devfreq_set_target. The patch draws on Tobias Jakobi's work posted ~2 years ago, who tried to solve issue with devfreq device's frequency during suspend/resume. During the discussion on LKML some corner cases and comments appeared related to the design. This patch address them keeping in mind suggestions from Chanwoo Choi. Suggested-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de> Suggested-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com> --- drivers/devfreq/devfreq.c | 62 ++++++++++++++++++++++++++++------------------- 1 file changed, 37 insertions(+), 25 deletions(-) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index e20e7e4..cf9c643 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -285,6 +285,42 @@ static int devfreq_notify_transition(struct devfreq *devfreq, return 0; } +static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq, + unsigned long *prev_freq, u32 flags) +{ + struct devfreq_freqs freqs; + unsigned long cur_freq; + int err = 0; + + if (devfreq->profile->get_cur_freq) + devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); + else + cur_freq = devfreq->previous_freq; + + freqs.old = cur_freq; + freqs.new = new_freq; + devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); + + err = devfreq->profile->target(devfreq->dev.parent, &new_freq, flags); + if (err) { + freqs.new = cur_freq; + devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); + return err; + } + + freqs.new = new_freq; + devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); + + if (devfreq_update_status(devfreq, new_freq)) + dev_err(&devfreq->dev, + "Couldn't update frequency transition information.\n"); + + devfreq->previous_freq = new_freq; + *prev_freq = cur_freq; + + return err; +} + /* Load monitoring helper functions for governors use */ /** @@ -296,7 +332,6 @@ static int devfreq_notify_transition(struct devfreq *devfreq, */ int update_devfreq(struct devfreq *devfreq) { - struct devfreq_freqs freqs; unsigned long freq, cur_freq, min_freq, max_freq; int err = 0; u32 flags = 0; @@ -333,31 +368,8 @@ int update_devfreq(struct devfreq *devfreq) flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */ } - if (devfreq->profile->get_cur_freq) - devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq); - else - cur_freq = devfreq->previous_freq; - - freqs.old = cur_freq; - freqs.new = freq; - devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE); + return devfreq_set_target(devfreq, freq, &cur_freq, flags); - err = devfreq->profile->target(devfreq->dev.parent, &freq, flags); - if (err) { - freqs.new = cur_freq; - devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); - return err; - } - - freqs.new = freq; - devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE); - - if (devfreq_update_status(devfreq, freq)) - dev_err(&devfreq->dev, - "Couldn't update frequency transition information.\n"); - - devfreq->previous_freq = freq; - return err; } EXPORT_SYMBOL(update_devfreq); -- 2.7.4
next prev parent reply other threads:[~2018-11-21 18:02 UTC|newest] Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <CGME20181121180156eucas1p225af7f4341a039264ff26f2a9ad9bb12@eucas1p2.samsung.com> 2018-11-21 18:01 ` [PATCH 0/6] devfreq: handle suspend/resume Lukasz Luba 2018-11-21 18:01 ` Lukasz Luba [not found] ` <CGME20181121180201eucas1p1f1f96941c3d16a96722e65d5c21bfe80@eucas1p1.samsung.com> 2018-11-21 18:01 ` [PATCH 1/6] devfreq: add basic fileds supporting suspend functionality Lukasz Luba 2018-11-21 18:01 ` Lukasz Luba 2018-11-22 2:37 ` Chanwoo Choi 2018-11-22 2:37 ` Chanwoo Choi [not found] ` <CGME20181121180202eucas1p27d3aa58411abeae03181c38b91fc67de@eucas1p2.samsung.com> 2018-11-21 18:01 ` Lukasz Luba [this message] 2018-11-21 18:01 ` [PATCH 2/6] devfreq: refactor set_target frequency function Lukasz Luba 2018-11-22 2:52 ` Chanwoo Choi 2018-11-22 2:52 ` Chanwoo Choi 2018-11-22 2:54 ` Chanwoo Choi 2018-11-22 2:54 ` Chanwoo Choi 2018-11-22 10:40 ` Lukasz Luba 2018-11-22 10:40 ` Lukasz Luba 2018-11-22 23:45 ` Chanwoo Choi 2018-11-22 23:45 ` Chanwoo Choi 2018-11-23 9:58 ` Lukasz Luba 2018-11-23 9:58 ` Lukasz Luba [not found] ` <CGME20181121180204eucas1p1c5891d498aa59c0e10dd3ba4727a4382@eucas1p1.samsung.com> 2018-11-21 18:01 ` [PATCH 3/6] devfreq: add support for suspend/resume of a devfreq device Lukasz Luba 2018-11-21 18:01 ` Lukasz Luba 2018-11-21 18:01 ` Lukasz Luba 2018-11-22 2:58 ` Chanwoo Choi 2018-11-22 2:58 ` Chanwoo Choi 2018-11-22 11:00 ` Lukasz Luba 2018-11-22 11:00 ` Lukasz Luba 2018-11-22 23:54 ` Chanwoo Choi 2018-11-22 23:54 ` Chanwoo Choi 2018-11-23 10:01 ` Lukasz Luba 2018-11-23 10:01 ` Lukasz Luba 2018-11-26 0:19 ` Chanwoo Choi 2018-11-26 0:19 ` Chanwoo Choi 2018-12-03 14:05 ` Lukasz Luba 2018-12-03 14:05 ` Lukasz Luba [not found] ` <CGME20181121180205eucas1p1dc52369476400cd07058d232bd8dbcd7@eucas1p1.samsung.com> 2018-11-21 18:01 ` [PATCH 4/6] devfreq: add devfreq_suspend/resume() functions Lukasz Luba 2018-11-21 18:01 ` Lukasz Luba 2018-11-22 3:07 ` Chanwoo Choi 2018-11-22 3:07 ` Chanwoo Choi 2018-11-22 11:02 ` Lukasz Luba 2018-11-22 11:02 ` Lukasz Luba [not found] ` <CGME20181121180206eucas1p265865226e3938a28e842e8367233dc2e@eucas1p2.samsung.com> 2018-11-21 18:01 ` [PATCH 5/6] drivers: power: suspend: call devfreq suspend/resume Lukasz Luba 2018-11-21 18:01 ` Lukasz Luba 2018-11-22 3:08 ` Chanwoo Choi 2018-11-22 3:08 ` Chanwoo Choi [not found] ` <CGME20181121180208eucas1p11482a783ab1b1bceb8c9f6a1f50682c3@eucas1p1.samsung.com> 2018-11-21 18:01 ` [PATCH 6/6] arm: dts: exynos4: set opp-suspend for DMC and leftbus Lukasz Luba 2018-11-21 18:01 ` Lukasz Luba 2018-11-22 3:09 ` Chanwoo Choi 2018-11-22 3:09 ` Chanwoo Choi 2018-11-22 11:04 ` Lukasz Luba 2018-11-22 11:04 ` Lukasz Luba 2018-11-22 17:24 ` [PATCH 0/6] devfreq: handle suspend/resume Tobias Jakobi 2018-11-22 17:24 ` Tobias Jakobi 2018-11-22 17:44 ` Lukasz Luba 2018-11-22 17:44 ` Lukasz Luba [not found] ` <CGME20181121180201eucas1p1f1f96941c3d16a96722e65d5c21bfe80@epcms1p8> 2018-11-26 8:14 ` [PATCH 1/6] devfreq: add basic fileds supporting suspend functionality MyungJoo Ham 2018-11-26 8:14 ` MyungJoo Ham 2018-11-26 8:14 ` MyungJoo Ham 2018-12-03 14:03 ` Lukasz Luba 2018-12-03 14:03 ` Lukasz Luba 2018-12-03 14:03 ` Lukasz Luba
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