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staging: fbtft: fb_ssd1306: Refactor write_vmem()

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Refactor write_vmem() for sake of readability.

While here, fix indentation in one comment.

Acked-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko
2017-01-19 12:45:45 +02:00
committed by Greg Kroah-Hartman
parent 95ecde0f65
commit 09249ecdfd
1 changed files with 7 additions and 9 deletions
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16
drivers/staging/fbtft/fb_ssd1306.c
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@@ -84,7 +84,7 @@ static int init_display(struct fbtft_par *par)
/* Vertical addressing mode */
write_reg(par, 0x01);
/*Set Segment Re-map */
/* Set Segment Re-map */
/* column address 127 is mapped to SEG0 */
write_reg(par, 0xA0 | 0x1);
@@ -183,26 +183,24 @@ static int set_gamma(struct fbtft_par *par, unsigned long *curves)
static int write_vmem(struct fbtft_par *par, size_t offset, size_t len)
{
u16 *vmem16 = (u16 *)par->info->screen_buffer;
u32 xres = par->info->var.xres;
u32 yres = par->info->var.yres;
u8 *buf = par->txbuf.buf;
int x, y, i;
int ret = 0;
for (x = 0; x < par->info->var.xres; x++) {
for (y = 0; y < par->info->var.yres/8; y++) {
for (x = 0; x < xres; x++) {
for (y = 0; y < yres / 8; y++) {
*buf = 0x00;
for (i = 0; i < 8; i++)
*buf |= (vmem16[(y * 8 + i) *
par->info->var.xres + x] ?
1 : 0) << i;
*buf |= (vmem16[(y * 8 + i) * xres + x] ? 1 : 0) << i;
buf++;
}
}
/* Write data */
gpio_set_value(par->gpio.dc, 1);
ret = par->fbtftops.write(par, par->txbuf.buf,
par->info->var.xres * par->info->var.yres /
8);
ret = par->fbtftops.write(par, par->txbuf.buf, xres * yres / 8);
if (ret < 0)
dev_err(par->info->device, "write failed and returned: %d\n",
ret);