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-rw-r--r--package/kernel/mac80211/patches/307-ath10k-Delay-device-access-after-cold-reset.patch56
1 files changed, 56 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/307-ath10k-Delay-device-access-after-cold-reset.patch b/package/kernel/mac80211/patches/307-ath10k-Delay-device-access-after-cold-reset.patch
new file mode 100644
index 0000000000..51998c2641
--- /dev/null
+++ b/package/kernel/mac80211/patches/307-ath10k-Delay-device-access-after-cold-reset.patch
@@ -0,0 +1,56 @@
+From: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
+Date: Fri, 3 Jul 2015 11:45:42 +0530
+Subject: [PATCH] ath10k: Delay device access after cold reset
+
+It is observed that during cold reset pcie access right
+after a write operation to SOC_GLOBAL_RESET_ADDRESS causes
+Data Bus Error and system hard lockup. The reason
+for bus error is that pcie needs some time to get
+back to stable state for any transaction during cold reset. Add
+delay of 20 msecs after write of SOC_GLOBAL_RESET_ADDRESS
+to fix this issue.
+
+Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
+---
+
+--- a/drivers/net/wireless/ath/ath10k/pci.c
++++ b/drivers/net/wireless/ath/ath10k/pci.c
+@@ -2602,7 +2602,6 @@ static int ath10k_pci_wait_for_target_in
+
+ static int ath10k_pci_cold_reset(struct ath10k *ar)
+ {
+- int i;
+ u32 val;
+
+ ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot cold reset\n");
+@@ -2618,23 +2617,18 @@ static int ath10k_pci_cold_reset(struct
+ val |= 1;
+ ath10k_pci_reg_write32(ar, SOC_GLOBAL_RESET_ADDRESS, val);
+
+- for (i = 0; i < ATH_PCI_RESET_WAIT_MAX; i++) {
+- if (ath10k_pci_reg_read32(ar, RTC_STATE_ADDRESS) &
+- RTC_STATE_COLD_RESET_MASK)
+- break;
+- msleep(1);
+- }
++ /* After writing into SOC_GLOBAL_RESET to put device into
++ * reset and pulling out of reset pcie may not be stable
++ * for any immediate pcie register access and cause bus error,
++ * add delay before any pcie access request to fix this issue.
++ */
++ msleep(20);
+
+ /* Pull Target, including PCIe, out of RESET. */
+ val &= ~1;
+ ath10k_pci_reg_write32(ar, SOC_GLOBAL_RESET_ADDRESS, val);
+
+- for (i = 0; i < ATH_PCI_RESET_WAIT_MAX; i++) {
+- if (!(ath10k_pci_reg_read32(ar, RTC_STATE_ADDRESS) &
+- RTC_STATE_COLD_RESET_MASK))
+- break;
+- msleep(1);
+- }
++ msleep(20);
+
+ ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot cold reset complete\n");
+