From: Carl Huang <cjhuang@codeaurora.org>
Date: Thu, 17 Dec 2020 15:22:10 +0000 (+0200)
Subject: ath11k: pci: disable ASPM L0sLs before downloading firmware
X-Git-Tag: v5.11-rc3~39^2~38^2~5^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e9603f4bdcc04417f1c7b3585e63654819dc11f6;p=thirdparty%2Fkernel%2Flinux.git

ath11k: pci: disable ASPM L0sLs before downloading firmware

Sometimes QCA6390 doesn't switch to amss state as device enters
L1ss state, so disable L0sL1s during firmware downloading.
Driver recovers the ASPM to default value in start callback
or powerdown callback.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1

Signed-off-by: Carl Huang <cjhuang@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/1608218530-15426-1-git-send-email-kvalo@codeaurora.org
---

diff --git a/drivers/net/wireless/ath/ath11k/pci.c b/drivers/net/wireless/ath/ath11k/pci.c
index 9f9a824a4c2d6..20b415cd96c4a 100644
--- a/drivers/net/wireless/ath/ath11k/pci.c
+++ b/drivers/net/wireless/ath/ath11k/pci.c
@@ -886,6 +886,32 @@ static void ath11k_pci_free_region(struct ath11k_pci *ab_pci)
 		pci_disable_device(pci_dev);
 }
 
+static void ath11k_pci_aspm_disable(struct ath11k_pci *ab_pci)
+{
+	struct ath11k_base *ab = ab_pci->ab;
+
+	pcie_capability_read_word(ab_pci->pdev, PCI_EXP_LNKCTL,
+				  &ab_pci->link_ctl);
+
+	ath11k_dbg(ab, ATH11K_DBG_PCI, "pci link_ctl 0x%04x L0s %d L1 %d\n",
+		   ab_pci->link_ctl,
+		   u16_get_bits(ab_pci->link_ctl, PCI_EXP_LNKCTL_ASPM_L0S),
+		   u16_get_bits(ab_pci->link_ctl, PCI_EXP_LNKCTL_ASPM_L1));
+
+	/* disable L0s and L1 */
+	pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL,
+				   ab_pci->link_ctl & ~PCI_EXP_LNKCTL_ASPMC);
+
+	set_bit(ATH11K_PCI_ASPM_RESTORE, &ab_pci->flags);
+}
+
+static void ath11k_pci_aspm_restore(struct ath11k_pci *ab_pci)
+{
+	if (test_and_clear_bit(ATH11K_PCI_ASPM_RESTORE, &ab_pci->flags))
+		pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL,
+					   ab_pci->link_ctl);
+}
+
 static int ath11k_pci_power_up(struct ath11k_base *ab)
 {
 	struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
@@ -895,6 +921,11 @@ static int ath11k_pci_power_up(struct ath11k_base *ab)
 	clear_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags);
 	ath11k_pci_sw_reset(ab_pci->ab, true);
 
+	/* Disable ASPM during firmware download due to problems switching
+	 * to AMSS state.
+	 */
+	ath11k_pci_aspm_disable(ab_pci);
+
 	ret = ath11k_mhi_start(ab_pci);
 	if (ret) {
 		ath11k_err(ab, "failed to start mhi: %d\n", ret);
@@ -908,6 +939,9 @@ static void ath11k_pci_power_down(struct ath11k_base *ab)
 {
 	struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
 
+	/* restore aspm in case firmware bootup fails */
+	ath11k_pci_aspm_restore(ab_pci);
+
 	ath11k_pci_force_wake(ab_pci->ab);
 	ath11k_mhi_stop(ab_pci);
 	clear_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags);
@@ -965,6 +999,8 @@ static int ath11k_pci_start(struct ath11k_base *ab)
 
 	set_bit(ATH11K_PCI_FLAG_INIT_DONE, &ab_pci->flags);
 
+	ath11k_pci_aspm_restore(ab_pci);
+
 	ath11k_pci_ce_irqs_enable(ab);
 	ath11k_ce_rx_post_buf(ab);
 
diff --git a/drivers/net/wireless/ath/ath11k/pci.h b/drivers/net/wireless/ath/ath11k/pci.h
index 0432a702416b4..fe44d0dfce195 100644
--- a/drivers/net/wireless/ath/ath11k/pci.h
+++ b/drivers/net/wireless/ath/ath11k/pci.h
@@ -63,6 +63,7 @@ struct ath11k_msi_config {
 enum ath11k_pci_flags {
 	ATH11K_PCI_FLAG_INIT_DONE,
 	ATH11K_PCI_FLAG_IS_MSI_64,
+	ATH11K_PCI_ASPM_RESTORE,
 };
 
 struct ath11k_pci {
@@ -80,6 +81,7 @@ struct ath11k_pci {
 
 	/* enum ath11k_pci_flags */
 	unsigned long flags;
+	u16 link_ctl;
 };
 
 static inline struct ath11k_pci *ath11k_pci_priv(struct ath11k_base *ab)