[PATCH 2/4] wifi: brcmfmac: pcie: skip the host ready doorbell at init once it is a capability

[Andre Eikmeyer <dev@deq.rocks>]

With host ready in the host capabilities, the BCM4364 firmware halts on
the doorbell that brcmf_pcie_preinit() rings, before it answers the
first ioctl. The B3 of the MacBookPro16,1 does so on every load, the B2
of the MacBookPro15,1 on some:

  brcmf_pcie_handle_mb_data D2H_MB_DATA: FW HALT
  brcmf_attach: dongle is not responding: err=-5

The BCM4377 stays silent without the capability, so it stays. Once host
ready is a capability the firmware takes the doorbell as the exit from
D3, where Broadcom's DHD driver rings it, after D0_INFORM. Ring it at
init only when host ready is not a capability.

Signed-off-by: Andre Eikmeyer <dev@deq.rocks>
---
 .../net/wireless/broadcom/brcm80211/brcmfmac/pcie.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
index 231a2fb89f0..fc0f23477eb 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -325,6 +325,7 @@ struct brcmf_pcie_shared_info {
 	dma_addr_t ringupd_dmahandle;
 	u8 version;
 	bool mb_via_ctl;
+	bool hostrdy;
 };
 
 #define BRCMF_OTP_MAX_PARAM_LEN 16
@@ -1599,7 +1600,13 @@ static int brcmf_pcie_preinit(struct device *dev)
 	brcmf_dbg(PCIE, "Enter\n");
 
 	brcmf_pcie_intr_enable(buspub->devinfo);
-	brcmf_pcie_hostready(buspub->devinfo);
+	/*
+	 * Once the host capabilities enable host ready, the firmware takes the
+	 * doorbell as the exit from D3 only. The BCM4364 firmware halts on it
+	 * here.
+	 */
+	if (!buspub->devinfo->shared.hostrdy)
+		brcmf_pcie_hostready(buspub->devinfo);
 
 	return 0;
 }
@@ -1806,8 +1813,10 @@ brcmf_pcie_init_share_ram_info(struct brcmf_pciedev_info *devinfo,
 			!(shared->flags & BRCMF_PCIE_SHARED_USE_MAILBOX);
 
 		host_cap = shared->version;
-		if (shared->flags & BRCMF_PCIE_SHARED_HOSTRDY_DB1)
+		if (shared->flags & BRCMF_PCIE_SHARED_HOSTRDY_DB1) {
 			host_cap |= BRCMF_HOSTCAP_H2D_ENABLE_HOSTRDY;
+			shared->hostrdy = true;
+		}
 		if (shared->flags & BRCMF_PCIE_SHARED_DAR)
 			host_cap |= BRCMF_HOSTCAP_H2D_DAR;
 		host_cap |= BRCMF_HOSTCAP_DS_NO_OOB_DW;