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 (cherry picked from commit 2e75396f1df61e1f1d26d0d703fc7292c4ae4371) --- drivers/soc/bcm/bcm2835-power.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/soc/bcm/bcm2835-power.c b/drivers/soc/bcm/bcm2835-power.c index 5bcd047768b6..cbcd1298ef5b 100644 --- a/drivers/soc/bcm/bcm2835-power.c +++ b/drivers/soc/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; -- 2.41.0