linux-kernel - [PATCH v2 29/35] brcmfmac: pcie: Read the console on init and shutdown

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Date:   Tue,  4 Jan 2022 16:26:52 +0900
From:   Hector Martin <marcan@...can.st>
To:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        Dmitry Osipenko <digetx@...il.com>
Cc:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Mark Kettenis <kettenis@...nbsd.org>,
        Rafał Miłecki <zajec5@...il.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        "John W. Linville" <linville@...driver.com>,
        "brian m. carlson" <sandals@...stytoothpaste.net>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com
Subject: [PATCH v2 29/35] brcmfmac: pcie: Read the console on init and shutdown

This allows us to get console messages if the firmware crashed during
early init, or if an operation failed and we're about to shut down.

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Hector Martin <marcan@...can.st>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
index c052f7961f44..b3c780608e80 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -851,6 +851,8 @@ static void brcmf_pcie_bus_console_read(struct brcmf_pciedev_info *devinfo,
 		return;
 
 	console = &devinfo->shared.console;
+	if (!console->base_addr)
+		return;
 	addr = console->base_addr + BRCMF_CONSOLE_WRITEIDX_OFFSET;
 	newidx = brcmf_pcie_read_tcm32(devinfo, addr);
 	while (newidx != console->read_idx) {
@@ -1627,6 +1629,7 @@ brcmf_pcie_init_share_ram_info(struct brcmf_pciedev_info *devinfo,
 		  shared->max_rxbufpost, shared->rx_dataoffset);
 
 	brcmf_pcie_bus_console_init(devinfo);
+	brcmf_pcie_bus_console_read(devinfo, false);
 
 	return 0;
 }
@@ -2387,6 +2390,7 @@ brcmf_pcie_remove(struct pci_dev *pdev)
 		return;
 
 	devinfo = bus->bus_priv.pcie->devinfo;
+	brcmf_pcie_bus_console_read(devinfo, false);
 
 	devinfo->state = BRCMFMAC_PCIE_STATE_DOWN;
 	if (devinfo->ci)
-- 
2.33.0