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| author |  Maíra Canal <mcanal@igalia.com>
| 2023-10-24 07:10:40 -0300 |
|---|---|---|
| committer |  Ulf Hansson <ulf.hansson@linaro.org>
| 2023-10-24 12:44:24 +0200 |
| commit | 2e75396f1df61e1f1d26d0d703fc7292c4ae4371 (patch) | |
| tree | a633629867c8a839da8ac27ac0aab6c031626a5a /drivers/pmdomain | |
| parent | pmdomain: imx: scu-pd: correct DMA2 channel (diff) | |
| download | linux-2e75396f1df61e1f1d26d0d703fc7292c4ae4371.tar.gz linux-2e75396f1df61e1f1d26d0d703fc7292c4ae4371.tar.bz2 linux-2e75396f1df61e1f1d26d0d703fc7292c4ae4371.zip | |
pmdomain: bcm: bcm2835-power: check if the ASB register is equal to enable
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>
Diffstat (limited to 'drivers/pmdomain')
| -rw-r--r-- | drivers/pmdomain/bcm/bcm2835-power.c | 2 |
1 files changed, 1 insertions, 1 deletions
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; |