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fbdev: ssd1307fb: Add a module parameter to set the refresh rate

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This patch adds the module parameter "refreshrate" to set delay for the
deferred io. The refresh rate is given in units of Hertz. The default
refresh rate is 1 Hz. The refresh rate set through the newly introduced
parameter applies to all instances of the driver and for now it is not
possible to change it individually.

Signed-off-by: Thomas Niederprüm <niederp@physik.uni-kl.de>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Thomas Niederprüm 2015-03-31 20:27:13 +02:00 committed by Tomi Valkeinen
parent 5f2d36b3cf
commit 3277e0bb8f
1 changed files with 17 additions and 6 deletions
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23
drivers/video/fbdev/ssd1307fb.c
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@ -38,6 +38,11 @@
#define SSD1307FB_SET_COM_PINS_CONFIG 0xda
#define SSD1307FB_SET_VCOMH 0xdb
#define REFRESHRATE 1
static u_int refreshrate = REFRESHRATE;
module_param(refreshrate, uint, 0);
struct ssd1307fb_par;
struct ssd1307fb_deviceinfo {
@ -263,11 +268,6 @@ static void ssd1307fb_deferred_io(struct fb_info *info,
ssd1307fb_update_display(info->par);
}
static struct fb_deferred_io ssd1307fb_defio = {
.delay = HZ,
.deferred_io = ssd1307fb_deferred_io,
};
static int ssd1307fb_init(struct ssd1307fb_par *par)
{
int ret;
@ -466,6 +466,7 @@ static int ssd1307fb_probe(struct i2c_client *client,
{
struct fb_info *info;
struct device_node *node = client->dev.of_node;
struct fb_deferred_io *ssd1307fb_defio;
u32 vmem_size;
struct ssd1307fb_par *par;
u8 *vmem;
@ -536,10 +537,20 @@ static int ssd1307fb_probe(struct i2c_client *client,
goto fb_alloc_error;
}
ssd1307fb_defio = devm_kzalloc(&client->dev, sizeof(struct fb_deferred_io), GFP_KERNEL);
if (!ssd1307fb_defio) {
dev_err(&client->dev, "Couldn't allocate deferred io.\n");
ret = -ENOMEM;
goto fb_alloc_error;
}
ssd1307fb_defio->delay = HZ / refreshrate;
ssd1307fb_defio->deferred_io = ssd1307fb_deferred_io;
info->fbops = &ssd1307fb_ops;
info->fix = ssd1307fb_fix;
info->fix.line_length = par->width / 8;
info->fbdefio = &ssd1307fb_defio;
info->fbdefio = ssd1307fb_defio;
info->var = ssd1307fb_var;
info->var.xres = par->width;