The patch below does not apply to the 6.5-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.5.y git checkout FETCH_HEAD git cherry-pick -x 2e75396f1df61e1f1d26d0d703fc7292c4ae4371 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023112257-putdown-prozac-affa@gregkh' --subject-prefix 'PATCH 6.5.y' HEAD^..
Possible dependencies:
2e75396f1df6 ("pmdomain: bcm: bcm2835-power: check if the ASB register is equal to enable")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 2e75396f1df61e1f1d26d0d703fc7292c4ae4371 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ma=C3=ADra=20Canal?= mcanal@igalia.com Date: Tue, 24 Oct 2023 07:10:40 -0300 Subject: [PATCH] pmdomain: bcm: bcm2835-power: check if the ASB register is equal to enable MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
The commit c494a447c14e ("soc: bcm: bcm2835-power: Refactor ASB control") refactored the ASB control by using a general function to handle both the enable and disable. But this patch introduced a subtle regression: we need to check if !!(readl(base + reg) & ASB_ACK) == enable, not just check if (readl(base + reg) & ASB_ACK) == true.
Currently, this is causing an invalid register state in V3D when unloading and loading the driver, because `bcm2835_asb_disable()` will return -ETIMEDOUT and `bcm2835_asb_power_off()` will fail to disable the ASB slave for V3D.
Fixes: c494a447c14e ("soc: bcm: bcm2835-power: Refactor ASB control") Signed-off-by: Maíra Canal mcanal@igalia.com Reviewed-by: Florian Fainelli florian.fainelli@broadcom.com Reviewed-by: Stefan Wahren stefan.wahren@i2se.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20231024101251.6357-2-mcanal@igalia.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org
diff --git a/drivers/pmdomain/bcm/bcm2835-power.c b/drivers/pmdomain/bcm/bcm2835-power.c index 1a179d4e011c..d2f0233cb620 100644 --- a/drivers/pmdomain/bcm/bcm2835-power.c +++ b/drivers/pmdomain/bcm/bcm2835-power.c @@ -175,7 +175,7 @@ static int bcm2835_asb_control(struct bcm2835_power *power, u32 reg, bool enable } writel(PM_PASSWORD | val, base + reg);
- while (readl(base + reg) & ASB_ACK) { + while (!!(readl(base + reg) & ASB_ACK) == enable) { cpu_relax(); if (ktime_get_ns() - start >= 1000) return -ETIMEDOUT;