linux-hardening - [PATCH RFC 08/10] drm/panthor: devfreq: expose get_dev

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Message-Id: <20250905-mt8196-gpufreq-v1-8-7b6c2d6be221@collabora.com>
Date: Fri, 05 Sep 2025 12:23:04 +0200
From: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Boris Brezillon <boris.brezillon@...labora.com>, 
 Steven Price <steven.price@....com>, Liviu Dudau <liviu.dudau@....com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 MyungJoo Ham <myungjoo.ham@...sung.com>, 
 Kyungmin Park <kyungmin.park@...sung.com>, 
 Chanwoo Choi <cw00.choi@...sung.com>, Jassi Brar <jassisinghbrar@...il.com>, 
 Kees Cook <kees@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Chia-I Wu <olvaffe@...il.com>, Chen-Yu Tsai <wenst@...omium.org>, 
 kernel@...labora.com, dri-devel@...ts.freedesktop.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 linux-pm@...r.kernel.org, linux-hardening@...r.kernel.org, 
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject: [PATCH RFC 08/10] drm/panthor: devfreq: expose get_dev_status and
 make it more generic

The only device-specific part of panthor's get_dev_status devfreq
callback is getting the clock frequency. All the other logic surrounding
what it does may be useful for other devfreq implementations however.

Expose it in the panthor_devfreq.h header file, and make it call back
into get_cur_freq instead of poking the common clock framework directly.

Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
---
 drivers/gpu/drm/panthor/panthor_devfreq.c | 29 +++++++++++++++++------------
 drivers/gpu/drm/panthor/panthor_devfreq.h |  3 +++
 2 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_devfreq.c b/drivers/gpu/drm/panthor/panthor_devfreq.c
index 02eb3ca15d1874e1cbafc6b614b196c5cc75b6a1..d495dd856299826c4bddc205087d8914d01d7fc4 100644
--- a/drivers/gpu/drm/panthor/panthor_devfreq.c
+++ b/drivers/gpu/drm/panthor/panthor_devfreq.c
@@ -43,6 +43,15 @@ static int panthor_devfreq_target(struct device *dev, unsigned long *freq,
 	return err;
 }

+static int panthor_devfreq_get_cur_freq(struct device *dev, unsigned long *freq)
+{
+	struct panthor_device *ptdev = dev_get_drvdata(dev);
+
+	*freq = clk_get_rate(ptdev->clks.core);
+
+	return 0;
+}
+
 static void panthor_devfreq_reset(struct panthor_devfreq *pdevfreq)
 {
 	pdevfreq->busy_time = 0;
@@ -50,14 +59,18 @@ static void panthor_devfreq_reset(struct panthor_devfreq *pdevfreq)
 	pdevfreq->time_last_update = ktime_get();
 }

-static int panthor_devfreq_get_dev_status(struct device *dev,
-					  struct devfreq_dev_status *status)
+int panthor_devfreq_get_dev_status(struct device *dev,
+				   struct devfreq_dev_status *status)
 {
 	struct panthor_device *ptdev = dev_get_drvdata(dev);
 	struct panthor_devfreq *pdevfreq = ptdev->devfreq;
+	struct devfreq_dev_profile *p = pdevfreq->devfreq->profile;
 	unsigned long irqflags;
+	int ret;

-	status->current_frequency = clk_get_rate(ptdev->clks.core);
+	ret = p->get_cur_freq(dev, &status->current_frequency);
+	if (ret)
+		return ret;

 	spin_lock_irqsave(&pdevfreq->lock, irqflags);

@@ -79,15 +92,7 @@ static int panthor_devfreq_get_dev_status(struct device *dev,

 	return 0;
 }
-
-static int panthor_devfreq_get_cur_freq(struct device *dev, unsigned long *freq)
-{
-	struct panthor_device *ptdev = dev_get_drvdata(dev);
-
-	*freq = clk_get_rate(ptdev->clks.core);
-
-	return 0;
-}
+EXPORT_SYMBOL(panthor_devfreq_get_dev_status);

 static struct devfreq_dev_profile panthor_devfreq_profile = {
 	.timer = DEVFREQ_TIMER_DELAYED,
diff --git a/drivers/gpu/drm/panthor/panthor_devfreq.h b/drivers/gpu/drm/panthor/panthor_devfreq.h
index e8b5ccddd45c52ee3215e9c84c6ebd9109640282..a891cb5fdc34636444f141e10f5d45828fc35b51 100644
--- a/drivers/gpu/drm/panthor/panthor_devfreq.h
+++ b/drivers/gpu/drm/panthor/panthor_devfreq.h
@@ -52,6 +52,9 @@ void panthor_devfreq_suspend(struct panthor_device *ptdev);
 void panthor_devfreq_record_busy(struct panthor_device *ptdev);
 void panthor_devfreq_record_idle(struct panthor_device *ptdev);

+int panthor_devfreq_get_dev_status(struct device *dev,
+				   struct devfreq_dev_status *status);
+
 unsigned long panthor_devfreq_get_freq(struct panthor_device *ptdev);

 #endif /* __PANTHOR_DEVFREQ_H__ */

-- 
2.51.0