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35 lines
1.2 KiB
Diff
35 lines
1.2 KiB
Diff
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From a91d93b66590d912b1551f707b083348c7af4836 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Tue, 19 Oct 2021 11:23:43 +0100
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Subject: [PATCH 571/634] gpio: bcm-virt: Fix the get() method
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The get() method does not understand the on-the-wire encoding of the
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remote GPIO states, thinking they are simple on/off bits when they are
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really pairs of 16-bit counts. Rewrite the get() handler to return the
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value last written, which will eventually match the actual GPIO state
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if there are no other changes.
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See: https://github.com/raspberrypi/linux/issues/4638
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/gpio/gpio-bcm-virt.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/gpio/gpio-bcm-virt.c b/drivers/gpio/gpio-bcm-virt.c
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index 49e28ad9760e..55c40190e88a 100644
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--- a/drivers/gpio/gpio-bcm-virt.c
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+++ b/drivers/gpio/gpio-bcm-virt.c
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@@ -49,7 +49,7 @@ static int brcmvirt_gpio_get(struct gpio_chip *gc, unsigned off)
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unsigned v;
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gpio = container_of(gc, struct brcmvirt_gpio, gc);
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v = readl(gpio->ts_base + off);
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- return (v >> off) & 1;
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+ return (s16)((v >> 16) - v) > 0;
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}
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static void brcmvirt_gpio_set(struct gpio_chip *gc, unsigned off, int val)
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--
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2.33.1
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