6.12-stable review patch. If anyone has any objections, please let me know.
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From: Adrián Larumbe adrian.larumbe@collabora.com
[ Upstream commit 37591ae11f89cdfc0a647945a589468642a44c17 ]
In order to support UM in calculating rates of GPU utilisation, the current operating and maximum GPU clock frequencies must be recorded during device initialisation, and also during OPP state transitions.
Signed-off-by: Adrián Larumbe adrian.larumbe@collabora.com Reviewed-by: Steven Price steven.price@arm.com Reviewed-by: Boris Brezillon boris.brezillon@collabora.com Signed-off-by: Boris Brezillon boris.brezillon@collabora.com Link: https://patchwork.freedesktop.org/patch/msgid/20240923230912.2207320-3-adria... Stable-dep-of: 21c23e4b64e3 ("drm/panthor: Fix OPP refcnt leaks in devfreq initialisation") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/panthor/panthor_devfreq.c | 18 +++++++++++++++++- drivers/gpu/drm/panthor/panthor_device.h | 6 ++++++ 2 files changed, 23 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/panthor/panthor_devfreq.c b/drivers/gpu/drm/panthor/panthor_devfreq.c index c6d3c327cc24c..9d0f891b9b534 100644 --- a/drivers/gpu/drm/panthor/panthor_devfreq.c +++ b/drivers/gpu/drm/panthor/panthor_devfreq.c @@ -62,14 +62,20 @@ static void panthor_devfreq_update_utilization(struct panthor_devfreq *pdevfreq) static int panthor_devfreq_target(struct device *dev, unsigned long *freq, u32 flags) { + struct panthor_device *ptdev = dev_get_drvdata(dev); struct dev_pm_opp *opp; + int err;
opp = devfreq_recommended_opp(dev, freq, flags); if (IS_ERR(opp)) return PTR_ERR(opp); dev_pm_opp_put(opp);
- return dev_pm_opp_set_rate(dev, *freq); + err = dev_pm_opp_set_rate(dev, *freq); + if (!err) + ptdev->current_frequency = *freq; + + return err; }
static void panthor_devfreq_reset(struct panthor_devfreq *pdevfreq) @@ -130,6 +136,7 @@ int panthor_devfreq_init(struct panthor_device *ptdev) struct panthor_devfreq *pdevfreq; struct dev_pm_opp *opp; unsigned long cur_freq; + unsigned long freq = ULONG_MAX; int ret;
pdevfreq = drmm_kzalloc(&ptdev->base, sizeof(*ptdev->devfreq), GFP_KERNEL); @@ -161,6 +168,7 @@ int panthor_devfreq_init(struct panthor_device *ptdev) return PTR_ERR(opp);
panthor_devfreq_profile.initial_freq = cur_freq; + ptdev->current_frequency = cur_freq;
/* Regulator coupling only takes care of synchronizing/balancing voltage * updates, but the coupled regulator needs to be enabled manually. @@ -204,6 +212,14 @@ int panthor_devfreq_init(struct panthor_device *ptdev)
dev_pm_opp_put(opp);
+ /* Find the fastest defined rate */ + opp = dev_pm_opp_find_freq_floor(dev, &freq); + if (IS_ERR(opp)) + return PTR_ERR(opp); + ptdev->fast_rate = freq; + + dev_pm_opp_put(opp); + /* * Setup default thresholds for the simple_ondemand governor. * The values are chosen based on experiments. diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h index a48e30d0af309..2109905813e8c 100644 --- a/drivers/gpu/drm/panthor/panthor_device.h +++ b/drivers/gpu/drm/panthor/panthor_device.h @@ -184,6 +184,12 @@ struct panthor_device {
/** @profile_mask: User-set profiling flags for job accounting. */ u32 profile_mask; + + /** @current_frequency: Device clock frequency at present. Set by DVFS*/ + unsigned long current_frequency; + + /** @fast_rate: Maximum device clock frequency. Set by DVFS */ + unsigned long fast_rate; };
/**