[openwrt/openwrt] mac80211: ath12k: prevent ltssm crash

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/935b2b7dcef61b2893ed5dff307dd8f8a1156899

commit 935b2b7dcef61b2893ed5dff307dd8f8a1156899
Author: Janusz Dziedzic <janusz.dziedzic at gmail.com>
AuthorDate: Mon Jun 24 18:48:46 2024 +0200

    mac80211: ath12k: prevent ltssm crash
    
    Fix ltssm crashes on BPI-Rx boards.
    Seems read32/write32 using wrong address which
    is not a problem on x86/64 PCI controllers.
    But have issues on BPI-Rx boards.
    
    Signed-off-by: Janusz Dziedzic <janusz.dziedzic at gmail.com>
    Link: https://github.com/openwrt/openwrt/pull/15945
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 .../ath12k/100-ath12k-prevent-ltssm-startup-crash.patch | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/package/kernel/mac80211/patches/ath12k/100-ath12k-prevent-ltssm-startup-crash.patch b/package/kernel/mac80211/patches/ath12k/100-ath12k-prevent-ltssm-startup-crash.patch
new file mode 100644
index 0000000000..cd85a0f6aa
--- /dev/null
+++ b/package/kernel/mac80211/patches/ath12k/100-ath12k-prevent-ltssm-startup-crash.patch
@@ -0,0 +1,17 @@
+Fix ltssm crashes on BPI-Rx boards.
+Seems read32/write32 using wrong address which
+is not a problem on x86/64 PCI controllers.
+But have issues on BPI-Rx boards.
+
+--- a/drivers/net/wireless/ath/ath12k/pci.c
++++ b/drivers/net/wireless/ath/ath12k/pci.c
+@@ -277,6 +277,9 @@ static void ath12k_pci_enable_ltssm(stru
+ 	u32 val;
+ 	int i;
+ 
++	/* Prevent startup crash on BPI-Rx */
++	return;
++
+ 	val = ath12k_pci_read32(ab, PCIE_PCIE_PARF_LTSSM);
+ 
+ 	/* PCIE link seems very unstable after the Hot Reset*/