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ramips: mt7621: backport GPIO driver fix

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Backport 2 patches from linux-next to fix mt7621 GPIO driver

Signed-off-by: DENG Qingfang <dengqf6@mail2.sysu.edu.cn>
This commit is contained in:
DENG Qingfang 2020-03-17 20:54:34 +08:00 committed by Chuanhong Guo
parent 9ebb85c372
commit 7bd19dbe99
2 changed files with 118 additions and 0 deletions
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85
target/linux/ramips/patches-5.4/111-gpio-mmio-introduce-BGPIOF_NO_SET_ON_INPUT.patch Normal file
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@ -0,0 +1,85 @@
From 5d7b644aad721ecca20bd8976b38fb243fdc84f9 Mon Sep 17 00:00:00 2001
From: Chuanhong Guo <gch981213@gmail.com>
Date: Sun, 15 Mar 2020 20:13:37 +0800
Subject: [PATCH] gpio: mmio: introduce BGPIOF_NO_SET_ON_INPUT
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Some gpio controllers ignores pin value writing when that pin is
configured as input mode. As a result, bgpio_dir_out should set
pin to output before configuring pin values or gpio pin values
can't be set up properly.
Introduce two variants of bgpio_dir_out: bgpio_dir_out_val_first
and bgpio_dir_out_dir_first, and assign direction_output according
to a new flag: BGPIOF_NO_SET_ON_INPUT.
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Tested-by: René van Dorst <opensource@vdorst.com>
Reviewed-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
drivers/gpio/gpio-mmio.c | 23 +++++++++++++++++++----
include/linux/gpio/driver.h | 1 +
2 files changed, 20 insertions(+), 4 deletions(-)
--- a/drivers/gpio/gpio-mmio.c
+++ b/drivers/gpio/gpio-mmio.c
@@ -381,12 +381,10 @@ static int bgpio_get_dir(struct gpio_chi
return 1;
}
-static int bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
+static void bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
unsigned long flags;
- gc->set(gc, gpio, val);
-
spin_lock_irqsave(&gc->bgpio_lock, flags);
gc->bgpio_dir |= bgpio_line2mask(gc, gpio);
@@ -397,7 +395,21 @@ static int bgpio_dir_out(struct gpio_chi
gc->write_reg(gc->reg_dir_out, gc->bgpio_dir);
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
+}
+static int bgpio_dir_out_dir_first(struct gpio_chip *gc, unsigned int gpio,
+ int val)
+{
+ bgpio_dir_out(gc, gpio, val);
+ gc->set(gc, gpio, val);
+ return 0;
+}
+
+static int bgpio_dir_out_val_first(struct gpio_chip *gc, unsigned int gpio,
+ int val)
+{
+ gc->set(gc, gpio, val);
+ bgpio_dir_out(gc, gpio, val);
return 0;
}
@@ -530,7 +542,10 @@ static int bgpio_setup_direction(struct
if (dirout || dirin) {
gc->reg_dir_out = dirout;
gc->reg_dir_in = dirin;
- gc->direction_output = bgpio_dir_out;
+ if (flags & BGPIOF_NO_SET_ON_INPUT)
+ gc->direction_output = bgpio_dir_out_dir_first;
+ else
+ gc->direction_output = bgpio_dir_out_val_first;
gc->direction_input = bgpio_dir_in;
gc->get_direction = bgpio_get_dir;
} else {
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -567,6 +567,7 @@ int bgpio_init(struct gpio_chip *gc, str
#define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3)
#define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */
#define BGPIOF_NO_OUTPUT BIT(5) /* only input */
+#define BGPIOF_NO_SET_ON_INPUT BIT(6)
int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hwirq);

33
target/linux/ramips/patches-5.4/112-gpio-mt7621-add-BGPIOF_NO_SET_ON_INPUT-flag.patch Normal file
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@ -0,0 +1,33 @@
From ad65f02fd73e9a700f1693a4513ae923ca07beb0 Mon Sep 17 00:00:00 2001
From: Chuanhong Guo <gch981213@gmail.com>
Date: Sun, 15 Mar 2020 20:13:38 +0800
Subject: [PATCH] gpio: mt7621: add BGPIOF_NO_SET_ON_INPUT flag
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
DSET/DCLR registers only works on output pins. Add corresponding
BGPIOF_NO_SET_ON_INPUT flag to bgpio_init call to fix direction_out
behavior.
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Tested-by: René van Dorst <opensource@vdorst.com>
Reviewed-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
drivers/gpio/gpio-mt7621.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpio/gpio-mt7621.c
+++ b/drivers/gpio/gpio-mt7621.c
@@ -227,8 +227,8 @@ mediatek_gpio_bank_probe(struct device *
ctrl = mtk->base + GPIO_REG_DCLR + (rg->bank * GPIO_BANK_STRIDE);
diro = mtk->base + GPIO_REG_CTRL + (rg->bank * GPIO_BANK_STRIDE);
- ret = bgpio_init(&rg->chip, dev, 4,
- dat, set, ctrl, diro, NULL, 0);
+ ret = bgpio_init(&rg->chip, dev, 4, dat, set, ctrl, diro, NULL,
+ BGPIOF_NO_SET_ON_INPUT);
if (ret) {
dev_err(dev, "bgpio_init() failed\n");
return ret;