From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Guilherme G. Piccoli" Subject: [PATCH 06/30] soc: bcm: brcmstb: Document panic notifier action and remove useless header Date: Wed, 27 Apr 2022 19:49:00 -0300 Message-ID: <20220427224924.592546-7-gpiccoli@igalia.com> References: <20220427224924.592546-1-gpiccoli@igalia.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=5Wppui/4+4q1PWThaAiWQx32MHyg/obGwoGJE8vkLrA=; b=IRi7rvSSPrrOoy0S56lz2UJRtC W1l3fBj8xVxgLD6KW8zqEI0EfCOiXJW5ZsYXn2WVzqXNxfRkE81Vja/726PNP5gfd+ffe5+sSmine oDSQIDYY0LQtz/eUpNO/O3flF5w2323kd1e2RLGfs/+wuvi6OZjtA/cAWJ8y4DX82MWtYSxfkdu78 HNn3Scwjr+UIudJHWW8i9wi/BmFAgD6nNrsW4GexdH6x6p4zIq9laE/2q1VZR7YM8s/7fvEfIhVyD gNu+c9943row/xgSKe8GkhslCs6aT6+524Fp09jB/vhA283Kkt9uCVO689z6MyVp8qdL3zZfdmmrO nvvrYfq In-Reply-To: <20220427224924.592546-1-gpiccoli@igalia.com> List-ID: Content-Type: text/plain; charset="us-ascii" To: akpm@linux-foundation.org, bhe@redhat.com, pmladek@suse.com, kexec@lists.infradead.org Cc: linux-kernel@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com, coresight@lists.linaro.org, linuxppc-dev@lists.ozlabs.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-edac@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-leds@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-pm@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, linux-tegra@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, netdev@vger.kernel.org, openipmi-developer@lists.sourceforge.net, rcu@vger.kernel.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org, kernel-dev@igalia.com, gpiccoli@igalia.com, kernel@gpiccoli.net, halves@canonical.com, fabiomirmar@gmail.com The panic notifier of this driver is very simple code-wise, just a memory write to a special position with some numeric code. But this is not clear from the semantic point-of-view, and there is no public documentation about that either. After discussing this in the mailing-lists [0] and having Florian explained it very well, this patch just document that in the code for the future generations asking the same questions. Also, it removes a useless header. [0] https://lore.kernel.org/lkml/781cafb0-8d06-8b56-907a-5175c2da196a@gmail.com Fixes: 0b741b8234c8 ("soc: bcm: brcmstb: Add support for S2/S3/S5 suspend states (ARM)") Cc: Brian Norris Cc: Doug Berger Cc: Florian Fainelli Cc: Justin Chen Cc: Lee Jones Cc: Markus Mayer Signed-off-by: Guilherme G. Piccoli --- drivers/soc/bcm/brcmstb/pm/pm-arm.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/soc/bcm/brcmstb/pm/pm-arm.c b/drivers/soc/bcm/brcmstb/pm/pm-arm.c index 3cbb165d6e30..870686ae042b 100644 --- a/drivers/soc/bcm/brcmstb/pm/pm-arm.c +++ b/drivers/soc/bcm/brcmstb/pm/pm-arm.c @@ -25,7 +25,6 @@ #include #include #include -#include #include #include #include @@ -664,7 +663,20 @@ static void __iomem *brcmstb_ioremap_match(const struct of_device_id *matches, return of_io_request_and_map(dn, index, dn->full_name); } - +/* + * The AON is a small domain in the SoC that can retain its state across + * various system wide sleep states and specific reset conditions; the + * AON DATA RAM is a small RAM of a few words (< 1KB) which can store + * persistent information across such events. + * + * The purpose of the below panic notifier is to help with notifying + * the bootloader that a panic occurred and so that it should try its + * best to preserve the DRAM contents holding that buffer for recovery + * by the kernel as opposed to wiping out DRAM clean again. + * + * Reference: comment from Florian Fainelli, at + * https://lore.kernel.org/lkml/781cafb0-8d06-8b56-907a-5175c2da196a@gmail.com + */ static int brcmstb_pm_panic_notify(struct notifier_block *nb, unsigned long action, void *data) { -- 2.36.0