diff options
| author | Eric Anholt <eric@anholt.net> | 2015-05-13 23:10:32 +0300 |
|---|---|---|
| committer | Jassi Brar <jaswinder.singh@linaro.org> | 2015-06-13 13:50:39 +0300 |
| commit | 7d641938aa2ae433a97cc65ec622547cfe08f2ed (patch) | |
| tree | b054804a80400f4b1af73d9911d13f659f8c6ea1 | |
| parent | 07a7dba17132d7ebc5d9f34a06baedf2308ccc01 (diff) | |
| download | linux-7d641938aa2ae433a97cc65ec622547cfe08f2ed.tar.xz | |
mailbox/bcm2835: Fix mailbox full detection.
With the VC reader blocked and the ARM writing, MAIL0_STA reads empty
permanently while MAIL1_STA goes from empty (0x40000000) to non-empty
(0x00000001-0x00000007) to full (0x80000008).
This bug ended up having no effect on us, because all of our
transactions in the client driver were synchronous and under a mutex.
Suggested-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
| -rw-r--r-- | drivers/mailbox/bcm2835-mailbox.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mailbox/bcm2835-mailbox.c b/drivers/mailbox/bcm2835-mailbox.c index 4b13268529f9..0b47dd42f3bd 100644 --- a/drivers/mailbox/bcm2835-mailbox.c +++ b/drivers/mailbox/bcm2835-mailbox.c @@ -49,6 +49,7 @@ #define MAIL0_STA (ARM_0_MAIL0 + 0x18) #define MAIL0_CNF (ARM_0_MAIL0 + 0x1C) #define MAIL1_WRT (ARM_0_MAIL1 + 0x00) +#define MAIL1_STA (ARM_0_MAIL1 + 0x18) /* Status register: FIFO state. */ #define ARM_MS_FULL BIT(31) @@ -117,7 +118,7 @@ static bool bcm2835_last_tx_done(struct mbox_chan *link) bool ret; spin_lock(&mbox->lock); - ret = !(readl(mbox->regs + MAIL0_STA) & ARM_MS_FULL); + ret = !(readl(mbox->regs + MAIL1_STA) & ARM_MS_FULL); spin_unlock(&mbox->lock); return ret; } |