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* [PATCH AUTOSEL 5.10 01/25] phy: qcom-snps-femto-v2: keep cfg_ahb_clk enabled during runtime suspend
@ 2023-08-13 16:09 Sasha Levin
  2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 02/25] phy: qcom-snps-femto-v2: use qcom_snps_hsphy_suspend/resume error code Sasha Levin
                   ` (23 more replies)
  0 siblings, 24 replies; 26+ messages in thread
From: Sasha Levin @ 2023-08-13 16:09 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Adrien Thierry, Vinod Koul, Sasha Levin, agross, andersson,
	konrad.dybcio, kishon, linux-arm-msm, linux-phy

From: Adrien Thierry <athierry@redhat.com>

[ Upstream commit 45d89a344eb46db9dce851c28e14f5e3c635c251 ]

In the dwc3 core, both system and runtime suspend end up calling
dwc3_suspend_common(). From there, what happens for the PHYs depends on
the USB mode and whether the controller is entering system or runtime
suspend.

HOST mode:
  (1) system suspend on a non-wakeup-capable controller

  The [1] if branch is taken. dwc3_core_exit() is called, which ends up
  calling phy_power_off() and phy_exit(). Those two functions decrease the
  PM runtime count at some point, so they will trigger the PHY runtime
  sleep (assuming the count is right).

  (2) runtime suspend / system suspend on a wakeup-capable controller

  The [1] branch is not taken. dwc3_suspend_common() calls
  phy_pm_runtime_put_sync(). Assuming the ref count is right, the PHY
  runtime suspend op is called.

DEVICE mode:
  dwc3_core_exit() is called on both runtime and system sleep
  unless the controller is already runtime suspended.

OTG mode:
  (1) system suspend : dwc3_core_exit() is called

  (2) runtime suspend : do nothing

In host mode, the code seems to make a distinction between 1) runtime
sleep / system sleep for wakeup-capable controller, and 2) system sleep
for non-wakeup-capable controller, where phy_power_off() and phy_exit()
are only called for the latter. This suggests the PHY is not supposed to
be in a fully powered-off state for runtime sleep and system sleep for
wakeup-capable controller.

Moreover, downstream, cfg_ahb_clk only gets disabled for system suspend.
The clocks are disabled by phy->set_suspend() [2] which is only called
in the system sleep path through dwc3_core_exit() [3].

With that in mind, don't disable the clocks during the femto PHY runtime
suspend callback. The clocks will only be disabled during system suspend
for non-wakeup-capable controllers, through dwc3_core_exit().

[1] https://elixir.bootlin.com/linux/v6.4/source/drivers/usb/dwc3/core.c#L1988
[2] https://git.codelinaro.org/clo/la/kernel/msm-5.4/-/blob/LV.AU.1.2.1.r2-05300-gen3meta.0/drivers/usb/phy/phy-msm-snps-hs.c#L524
[3] https://git.codelinaro.org/clo/la/kernel/msm-5.4/-/blob/LV.AU.1.2.1.r2-05300-gen3meta.0/drivers/usb/dwc3/core.c#L1915

Signed-off-by: Adrien Thierry <athierry@redhat.com>
Link: https://lore.kernel.org/r/20230629144542.14906-2-athierry@redhat.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c
index 7e61202aa234e..a107f98c662d5 100644
--- a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c
+++ b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c
@@ -122,22 +122,13 @@ static int qcom_snps_hsphy_suspend(struct qcom_snps_hsphy *hsphy)
 					   0, USB2_AUTO_RESUME);
 	}
 
-	clk_disable_unprepare(hsphy->cfg_ahb_clk);
 	return 0;
 }
 
 static int qcom_snps_hsphy_resume(struct qcom_snps_hsphy *hsphy)
 {
-	int ret;
-
 	dev_dbg(&hsphy->phy->dev, "Resume QCOM SNPS PHY, mode\n");
 
-	ret = clk_prepare_enable(hsphy->cfg_ahb_clk);
-	if (ret) {
-		dev_err(&hsphy->phy->dev, "failed to enable cfg ahb clock\n");
-		return ret;
-	}
-
 	return 0;
 }
 
-- 
2.40.1


^ permalink raw reply related	[flat|nested] 26+ messages in thread
end of thread, other threads:[~2023-08-14 13:24 UTC | newest]

Thread overview: 26+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-08-13 16:09 [PATCH AUTOSEL 5.10 01/25] phy: qcom-snps-femto-v2: keep cfg_ahb_clk enabled during runtime suspend Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 02/25] phy: qcom-snps-femto-v2: use qcom_snps_hsphy_suspend/resume error code Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 03/25] media: pulse8-cec: handle possible ping error Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 04/25] media: pci: cx23885: fix error handling for cx23885 ATSC boards Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 05/25] 9p: virtio: make sure 'offs' is initialized in zc_request Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 06/25] ASoC: da7219: Flush pending AAD IRQ when suspending Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 07/25] ASoC: da7219: Check for failure reading AAD IRQ events Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 08/25] ethernet: atheros: fix return value check in atl1c_tso_csum() Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 09/25] vxlan: generalize vxlan_parse_gpe_hdr and remove unused args Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 10/25] m68k: Fix invalid .section syntax Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 11/25] s390/dasd: use correct number of retries for ERP requests Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 12/25] s390/dasd: fix hanging device after request requeue Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 13/25] fs/nls: make load_nls() take a const parameter Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 14/25] ASoc: codecs: ES8316: Fix DMIC config Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 15/25] ASoC: atmel: Fix the 8K sample parameter in I2SC master Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 16/25] platform/x86: intel: hid: Always call BTNL ACPI method Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 17/25] platform/x86: huawei-wmi: Silence ambient light sensor Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 18/25] spi: spi-qcom-qspi: Add DMA_CHAIN_DONE to ALL_IRQS Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 19/25] drm/amd/display: Exit idle optimizations before attempt to access PHY Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 20/25] ovl: Always reevaluate the file signature for IMA Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 21/25] ata: pata_arasan_cf: Use dev_err_probe() instead dev_err() in data_xfer() Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 22/25] rbd: make get_lock_owner_info() return a single locker or NULL Sasha Levin
2023-08-14 13:23   ` Ilya Dryomov
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 23/25] staging: fbtft: ili9341: use macro FBTFT_REGISTER_SPI_DRIVER Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 24/25] security: keys: perform capable check only on privileged operations Sasha Levin
2023-08-13 16:09 ` [PATCH AUTOSEL 5.10 25/25] kprobes: Prohibit probing on CFI preamble symbol Sasha Levin

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