linux-kernel - [PATCH v2] Kconfig: reduce the amount of power sequencing noise

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Message-ID: <20240717142803.53248-1-brgl@bgdev.pl>
Date: Wed, 17 Jul 2024 16:28:03 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Kalle Valo <kvalo@...nel.org>,
	Jeff Johnson <jjohnson@...nel.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org,
	ath11k@...ts.infradead.org,
	ath12k@...ts.infradead.org,
	linux-pci@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH v2] Kconfig: reduce the amount of power sequencing noise

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Kconfig will ask the user twice about power sequencing: once for the QCom
WCN power sequencing driver and then again for the PCI power control
driver using it.

Let's automate the selection of PCI_PWRCTL by introducing a new hidden
symbol: HAVE_PWRCTL which should be selected by all platforms that have
the need to include PCI power control code (right now: only ARCH_QCOM).

The pwrseq-based PCI pwrctl driver itself will then be selected by the
drivers binding to devices that may require external handling of the
power-up sequence (currently: ath11k and ath12k) based on the value
of HAVE_PWRCTL.

Make all PCI pwrctl Kconfig symbols hidden so that no questions are
asked during configuration.

Fixes: 4565d2652a37 ("PCI/pwrctl: Add PCI power control core code")
Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Closes: https://lore.kernel.org/lkml/CAHk-=wjWc5dzcj2O1tEgNHY1rnQW63JwtuZi_vAZPqy6wqpoUQ@mail.gmail.com/
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
I'm sending it as a single patch for more clarity as it most likely will
end up being picked up by Linus directly.

Changes in v2:
- introduce new HAVE_PWRCTL symbol and select it from ARCH_QCOM
- select PCI_PWRCTL from the relevant drivers

 arch/arm64/Kconfig.platforms            |  1 +
 drivers/net/wireless/ath/ath11k/Kconfig |  1 +
 drivers/net/wireless/ath/ath12k/Kconfig |  1 +
 drivers/pci/pwrctl/Kconfig              | 11 +++--------
 4 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
index d1461335e78f..53d9f4bfd6fe 100644
--- a/arch/arm64/Kconfig.platforms
+++ b/arch/arm64/Kconfig.platforms
@@ -266,6 +266,7 @@ config ARCH_QCOM
 	bool "Qualcomm Platforms"
 	select GPIOLIB
 	select PINCTRL
+	select HAVE_PWRCTL
 	help
 	  This enables support for the ARMv8 based Qualcomm chipsets.
 
diff --git a/drivers/net/wireless/ath/ath11k/Kconfig b/drivers/net/wireless/ath/ath11k/Kconfig
index 27f0523bf967..2e935d381b6b 100644
--- a/drivers/net/wireless/ath/ath11k/Kconfig
+++ b/drivers/net/wireless/ath/ath11k/Kconfig
@@ -24,6 +24,7 @@ config ATH11K_PCI
 	select MHI_BUS
 	select QRTR
 	select QRTR_MHI
+	select PCI_PWRCTL_PWRSEQ if HAVE_PWRCTL
 	help
 	  This module adds support for PCIE bus
 
diff --git a/drivers/net/wireless/ath/ath12k/Kconfig b/drivers/net/wireless/ath/ath12k/Kconfig
index eceab9153e98..f64e7c322216 100644
--- a/drivers/net/wireless/ath/ath12k/Kconfig
+++ b/drivers/net/wireless/ath/ath12k/Kconfig
@@ -7,6 +7,7 @@ config ATH12K
 	select MHI_BUS
 	select QRTR
 	select QRTR_MHI
+	select PCI_PWRCTL_PWRSEQ if HAVE_PWRCTL
 	help
 	  Enable support for Qualcomm Technologies Wi-Fi 7 (IEEE
 	  802.11be) family of chipsets, for example WCN7850 and
diff --git a/drivers/pci/pwrctl/Kconfig b/drivers/pci/pwrctl/Kconfig
index f1b824955d4b..54589bb2403b 100644
--- a/drivers/pci/pwrctl/Kconfig
+++ b/drivers/pci/pwrctl/Kconfig
@@ -1,17 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
-menu "PCI Power control drivers"
+config HAVE_PWRCTL
+	bool
 
 config PCI_PWRCTL
 	tristate
 
 config PCI_PWRCTL_PWRSEQ
-	tristate "PCI Power Control driver using the Power Sequencing subsystem"
+	tristate
 	select POWER_SEQUENCING
 	select PCI_PWRCTL
-	default m if ((ATH11K_PCI || ATH12K) && ARCH_QCOM)
-	help
-	  Enable support for the PCI power control driver for device
-	  drivers using the Power Sequencing subsystem.
-
-endmenu
-- 
2.43.0