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fbtft:fix drive exception

This commit is contained in:
eng33 2024-01-06 14:42:11 +08:00 committed by luckfox-eng33
parent 982be7f4d9
commit 44168aeedb
1 changed files with 35 additions and 11 deletions
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46
sysdrv/source/kernel/drivers/staging/fbtft/fbtft-core.c
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@ -30,6 +30,9 @@
#include "fbtft.h"
#include "internal.h"
#include <linux/gpio.h>
#include <linux/of_gpio.h>
static unsigned long debug;
module_param(debug, ulong, 0000);
MODULE_PARM_DESC(debug, "override device debug level");
@ -75,16 +78,37 @@ static int fbtft_request_one_gpio(struct fbtft_par *par,
struct gpio_desc **gpiop)
{
struct device *dev = par->info->device;
struct device_node *node = dev->of_node;
int gpio, flags, ret = 0;
enum of_gpio_flags of_flags;
if (of_find_property(node, name, NULL)) {
gpio = of_get_named_gpio_flags(node, name, index, &of_flags);
if (gpio == -ENOENT)
return 0;
if (gpio == -EPROBE_DEFER)
return gpio;
if (gpio < 0) {
dev_err(dev,
"failed to get '%s' from DT\n", name);
return gpio;
}
//active low translates to initially low
flags = (of_flags & OF_GPIO_ACTIVE_LOW) ? GPIOF_OUT_INIT_LOW :
GPIOF_OUT_INIT_HIGH;
ret = devm_gpio_request_one(dev, gpio, flags,
dev->driver->name);
if (ret) {
dev_err(dev,
"gpio_request_one('%s'=%d) failed with %d\n",
name, gpio, ret);
return ret;
}
*gpiop = devm_gpiod_get_index_optional(dev, name, index,
GPIOD_OUT_LOW);
if (IS_ERR(*gpiop))
return dev_err_probe(dev, PTR_ERR(*gpiop), "Failed to request %s GPIO\n", name);
*gpiop = gpio_to_desc(gpio);
fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' = GPIO%d\n",__func__, name, gpio);
}
fbtft_par_dbg(DEBUG_REQUEST_GPIOS, par, "%s: '%s' GPIO\n",
__func__, name);
return 0;
return ret;
}
static int fbtft_request_gpios(struct fbtft_par *par)
@ -219,12 +243,12 @@ static void fbtft_reset(struct fbtft_par *par)
fbtft_par_dbg(DEBUG_RESET, par, "%s()\n", __func__);
gpiod_set_value_cansleep(par->gpio.reset, 1);
usleep_range(20, 40);
gpiod_set_value_cansleep(par->gpio.reset, 0);
usleep_range(20, 40);
gpiod_set_value_cansleep(par->gpio.reset, 1);
msleep(120);
gpiod_set_value_cansleep(par->gpio.cs, 1); /* Activate chip */
gpiod_set_value_cansleep(par->gpio.cs, 0); /* Activate chip */
}
static void fbtft_update_display(struct fbtft_par *par, unsigned int start_line,