mac80211: ath11k: hack for multiple card support

This is a temporary workaround for supporting multiple cards or AHB+PCI.

There is ongoing upstream work to properly support this based of
advertised FW features, but that is still ongoing.

This is only supported on QCN9074 cards due to FW limitation, so HW ID
is checked in order to prevent breaking QCA6390 and other popular cards.

Signed-off-by: Robert Marko <robimarko@gmail.com>

1 files changed, 162 insertions, 0 deletions

diff --git a/package/kernel/mac80211/patches/ath11k/100-wifi-ath11k-use-unique-QRTR-instance-ID.patch b/package/kernel/mac80211/patches/ath11k/100-wifi-ath11k-use-unique-QRTR-instance-ID.patch
new file mode 100644
index 0000000000..39d5a61d5a
--- /dev/null
+++ b/package/kernel/mac80211/patches/ath11k/100-wifi-ath11k-use-unique-QRTR-instance-ID.patch
@@ -0,0 +1,162 @@
+From 534a5f99d589cfa6b244b4433c192b6a278a67ff Mon Sep 17 00:00:00 2001
+From: Robert Marko <robimarko@gmail.com>
+Date: Sat, 5 Nov 2022 20:15:40 +0100
+Subject: [PATCH] wifi: ath11k: use unique QRTR instance ID
+
+Currently, trying to use AHB + PCI/MHI cards or multiple PCI/MHI cards
+will cause a clash in the QRTR instance node ID and prevent the driver
+from talking via QMI to the card and thus initializing it with:
+[    9.836329] ath11k c000000.wifi: host capability request failed: 1 90
+[    9.842047] ath11k c000000.wifi: failed to send qmi host cap: -22
+
+So, in order to allow for this combination of cards, especially AHB + PCI
+cards like IPQ8074 + QCN9074 (Used by me and tested on) set the desired
+QRTR instance ID offset by calculating a unique one based on PCI domain
+and bus ID-s and writing it to bits 7-0 of BHI_ERRDBG2 MHI register by
+using the SBL state callback that is added as part of the series.
+We also have to make sure that new QRTR offset is added on top of the
+default QRTR instance ID-s that are currently used in the driver.
+
+This finally allows using AHB + PCI or multiple PCI cards on the same
+system.
+
+Since this is not supported on QCA6390 and like, its limited to QCN9074
+which is known to support changing QRTR instance ID.
+
+Before:
+root@OpenWrt:/# qrtr-lookup
+  Service Version Instance Node  Port
+     1054       1        0    7     1 <unknown>
+       69       1        2    7     3 ATH10k WLAN firmware service
+
+After:
+root@OpenWrt:/# qrtr-lookup
+  Service Version Instance Node  Port
+     1054       1        0    7     1 <unknown>
+       69       1        2    7     3 ATH10k WLAN firmware service
+       15       1        0    8     1 Test service
+       69       1        8    8     2 ATH10k WLAN firmware service
+
+Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.5.0.1-01208-QCAHKSWPL_SILICONZ-1
+Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.5.0.1-01208-QCAHKSWPL_SILICONZ-1
+
+Signed-off-by: Robert Marko <robimarko@gmail.com>
+---
+ drivers/net/wireless/ath/ath11k/mhi.c | 49 ++++++++++++++++++---------
+ drivers/net/wireless/ath/ath11k/mhi.h |  3 ++
+ drivers/net/wireless/ath/ath11k/pci.c |  9 ++++-
+ 3 files changed, 44 insertions(+), 17 deletions(-)
+
+--- a/drivers/net/wireless/ath/ath11k/mhi.c
++++ b/drivers/net/wireless/ath/ath11k/mhi.c
+@@ -294,6 +294,34 @@ static void ath11k_mhi_op_runtime_put(st
+ {
+ }
+ 
++static int ath11k_mhi_op_read_reg(struct mhi_controller *mhi_cntrl,
++				  void __iomem *addr,
++				  u32 *out)
++{
++	*out = readl(addr);
++
++	return 0;
++}
++
++static void ath11k_mhi_op_write_reg(struct mhi_controller *mhi_cntrl,
++				    void __iomem *addr,
++				    u32 val)
++{
++	writel(val, addr);
++}
++
++static void ath11k_mhi_qrtr_instance_set(struct mhi_controller *mhi_cntrl)
++{
++	struct ath11k_base *ab = dev_get_drvdata(mhi_cntrl->cntrl_dev);
++
++	if (ab->hw_rev == ATH11K_HW_QCN9074_HW10) {
++		ath11k_mhi_op_write_reg(mhi_cntrl,
++					mhi_cntrl->bhi + BHI_ERRDBG2,
++					FIELD_PREP(QRTR_INSTANCE_MASK,
++					ab->qmi.service_ins_id - ab->hw_params.qmi_service_ins_id));
++	}
++}
++
+ static char *ath11k_mhi_op_callback_to_str(enum mhi_callback reason)
+ {
+ 	switch (reason) {
+@@ -315,6 +343,8 @@ static char *ath11k_mhi_op_callback_to_s
+ 		return "MHI_CB_FATAL_ERROR";
+ 	case MHI_CB_BW_REQ:
+ 		return "MHI_CB_BW_REQ";
++	case MHI_CB_EE_SBL_MODE:
++		return "MHI_CB_EE_SBL_MODE";
+ 	default:
+ 		return "UNKNOWN";
+ 	}
+@@ -336,27 +366,14 @@ static void ath11k_mhi_op_status_cb(stru
+ 		if (!(test_bit(ATH11K_FLAG_UNREGISTERING, &ab->dev_flags)))
+ 			queue_work(ab->workqueue_aux, &ab->reset_work);
+ 		break;
++	case MHI_CB_EE_SBL_MODE:
++		ath11k_mhi_qrtr_instance_set(mhi_cntrl);
++		break;
+ 	default:
+ 		break;
+ 	}
+ }
+ 
+-static int ath11k_mhi_op_read_reg(struct mhi_controller *mhi_cntrl,
+-				  void __iomem *addr,
+-				  u32 *out)
+-{
+-	*out = readl(addr);
+-
+-	return 0;
+-}
+-
+-static void ath11k_mhi_op_write_reg(struct mhi_controller *mhi_cntrl,
+-				    void __iomem *addr,
+-				    u32 val)
+-{
+-	writel(val, addr);
+-}
+-
+ static int ath11k_mhi_read_addr_from_dt(struct mhi_controller *mhi_ctrl)
+ {
+ 	struct device_node *np;
+--- a/drivers/net/wireless/ath/ath11k/mhi.h
++++ b/drivers/net/wireless/ath/ath11k/mhi.h
+@@ -16,6 +16,9 @@
+ #define MHICTRL					0x38
+ #define MHICTRL_RESET_MASK			0x2
+ 
++#define BHI_ERRDBG2				0x38
++#define QRTR_INSTANCE_MASK			GENMASK(7, 0)
++
+ int ath11k_mhi_start(struct ath11k_pci *ar_pci);
+ void ath11k_mhi_stop(struct ath11k_pci *ar_pci);
+ int ath11k_mhi_register(struct ath11k_pci *ar_pci);
+--- a/drivers/net/wireless/ath/ath11k/pci.c
++++ b/drivers/net/wireless/ath/ath11k/pci.c
+@@ -370,13 +370,20 @@ static void ath11k_pci_sw_reset(struct a
+ static void ath11k_pci_init_qmi_ce_config(struct ath11k_base *ab)
+ {
+ 	struct ath11k_qmi_ce_cfg *cfg = &ab->qmi.ce_cfg;
++	struct ath11k_pci *ab_pci = ath11k_pci_priv(ab);
++	struct pci_bus *bus = ab_pci->pdev->bus;
+ 
+ 	cfg->tgt_ce = ab->hw_params.target_ce_config;
+ 	cfg->tgt_ce_len = ab->hw_params.target_ce_count;
+ 
+ 	cfg->svc_to_ce_map = ab->hw_params.svc_to_ce_map;
+ 	cfg->svc_to_ce_map_len = ab->hw_params.svc_to_ce_map_len;
+-	ab->qmi.service_ins_id = ab->hw_params.qmi_service_ins_id;
++
++	if (ab->hw_rev == ATH11K_HW_QCN9074_HW10) {
++		ab->qmi.service_ins_id = ab->hw_params.qmi_service_ins_id +
++		(((pci_domain_nr(bus) & 0xF) << 4) | (bus->number & 0xF));
++	} else
++		ab->qmi.service_ins_id = ab->hw_params.qmi_service_ins_id;
+ 
+ 	ath11k_ce_get_shadow_config(ab, &cfg->shadow_reg_v2,
+ 				    &cfg->shadow_reg_v2_len);