linux-kernel - [RFC PATCH v1 11/13] wifi: ath12k: Use pci_disable/enable_link

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Date:   Fri,  2 Jun 2023 14:47:48 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Lukas Wunner <lukas@...ner.de>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, ath12k@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [RFC PATCH v1 11/13] wifi: ath12k: Use pci_disable/enable_link_state()

ath12k driver adjusts ASPM state itself which leaves ASPM service
driver in PCI core unaware of the link state changes the driver
implemented.

Call pci_disable_link_state() and pci_enable_link_state() instead of
adjusting ASPMC field in LNKCTL directly in the driver and let PCI core
handle the ASPM state management.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/net/wireless/ath/ath12k/pci.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/pci.c b/drivers/net/wireless/ath/ath12k/pci.c
index e1e45eb50f3e..c072026d6699 100644
--- a/drivers/net/wireless/ath/ath12k/pci.c
+++ b/drivers/net/wireless/ath/ath12k/pci.c
@@ -794,19 +794,15 @@ static void ath12k_pci_aspm_disable(struct ath12k_pci *ab_pci)
 		   u16_get_bits(ab_pci->link_ctl, PCI_EXP_LNKCTL_ASPM_L1));
 
 	/* disable L0s and L1 */
-	pcie_capability_clear_word(ab_pci->pdev, PCI_EXP_LNKCTL,
-				   PCI_EXP_LNKCTL_ASPMC);
-
+	pci_disable_link_state(ab_pci->pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
 	set_bit(ATH12K_PCI_ASPM_RESTORE, &ab_pci->flags);
 }
 
 static void ath12k_pci_aspm_restore(struct ath12k_pci *ab_pci)
 {
 	if (test_and_clear_bit(ATH12K_PCI_ASPM_RESTORE, &ab_pci->flags))
-		pcie_capability_clear_and_set_word(ab_pci->pdev, PCI_EXP_LNKCTL,
-						   PCI_EXP_LNKCTL_ASPMC,
-						   ab_pci->link_ctl &
-						   PCI_EXP_LNKCTL_ASPMC);
+		pci_enable_link_state(ab_pci->pdev, ab_pci->link_ctl &
+				      (PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1));
 }
 
 static void ath12k_pci_kill_tasklets(struct ath12k_base *ab)
-- 
2.30.2