2015-08-17 06:04:32 +00:00
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From 38a0a5c357245cfe2b359277bc38509fa05c268d Mon Sep 17 00:00:00 2001
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2015-07-17 12:48:39 +00:00
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From: Eric Anholt <eric@anholt.net>
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Date: Wed, 13 May 2015 13:10:32 -0700
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2015-08-17 06:04:32 +00:00
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Subject: [PATCH 110/148] mailbox/bcm2835: Fix mailbox full detection.
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2015-07-17 12:48:39 +00:00
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With the VC reader blocked and the ARM writing, MAIL0_STA reads empty
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permanently while MAIL1_STA goes from empty (0x40000000) to non-empty
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(0x00000001-0x00000007) to full (0x80000008).
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This bug ended up having no effect on us, because all of our
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transactions in the client driver were synchronous and under a mutex.
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Suggested-by: Phil Elwell <phil@raspberrypi.org>
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Signed-off-by: Eric Anholt <eric@anholt.net>
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Acked-by: Stephen Warren <swarren@wwwdotorg.org>
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Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
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---
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drivers/mailbox/bcm2835-mailbox.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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--- a/drivers/mailbox/bcm2835-mailbox.c
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+++ b/drivers/mailbox/bcm2835-mailbox.c
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@@ -49,6 +49,7 @@
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#define MAIL0_STA (ARM_0_MAIL0 + 0x18)
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#define MAIL0_CNF (ARM_0_MAIL0 + 0x1C)
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#define MAIL1_WRT (ARM_0_MAIL1 + 0x00)
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+#define MAIL1_STA (ARM_0_MAIL1 + 0x18)
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/* Status register: FIFO state. */
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#define ARM_MS_FULL BIT(31)
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@@ -117,7 +118,7 @@ static bool bcm2835_last_tx_done(struct
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bool ret;
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spin_lock(&mbox->lock);
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- ret = !(readl(mbox->regs + MAIL0_STA) & ARM_MS_FULL);
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+ ret = !(readl(mbox->regs + MAIL1_STA) & ARM_MS_FULL);
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spin_unlock(&mbox->lock);
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return ret;
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}
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