linux-kernel - [PATCH v4 9/9] brcmfmac: pcie: Read the console on init and shutdown

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Message-Id: <20220131160713.245637-10-marcan@marcan.st>
Date:   Tue,  1 Feb 2022 01:07:13 +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>,
        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,
        Arend van Spriel <arend.vanspriel@...adcom.com>
Subject: [PATCH v4 9/9] 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>
Reviewed-by: Arend van Spriel <arend.vanspriel@...adcom.com>
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 3ff4997e1c97..4fe341376a16 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -744,6 +744,8 @@ 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) {
@@ -1520,6 +1522,7 @@ 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;
 }
@@ -1959,6 +1962,7 @@ 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