Hi Arnd,
On Wed, 23 Nov 2016 14:06:49 +0100
Arnd Bergmann <a...@arndb.de> wrote:
> The new driver caused a rare randconfig failure:
>
> drivers/auxdisplay/ht16k33.o:(.data.ht16k33_fb_ops+0xc): undefined reference
> to `fb_sys_read'
> drivers/auxdisplay/ht16k33.o:(.data.ht16k33_fb_ops+0x10): undefined reference
> to `fb_sys_write'
>
> This selects the respective helper module, like all other
> such drivers do.
Thanks for reporting this. You are right about the missing helper.
However, the fb_ops struct uses several helpers which are all missing.
static struct fb_ops ht16k33_fb_ops = {
.owner = THIS_MODULE,
.fb_read = fb_sys_read,
.fb_write = fb_sys_write,
.fb_fillrect = sys_fillrect,
.fb_copyarea = sys_copyarea,
.fb_imageblit = sys_imageblit,
.fb_mmap = ht16k33_mmap,
};
HT16K33 should also select:
FB_CFB_FILLRECT
FB_CFB_COPYAREA
FB_CFB_IMAGEBLIT
>
> Fixes: 8992da44c680 ("auxdisplay: ht16k33: Driver for LED controller")
> Signed-off-by: Arnd Bergmann <a...@arndb.de>
> ---
> drivers/auxdisplay/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig
> index a230ea797b92..b8bbfc64a1d1 100644
> --- a/drivers/auxdisplay/Kconfig
> +++ b/drivers/auxdisplay/Kconfig
> @@ -131,6 +131,7 @@ config IMG_ASCII_LCD
> config HT16K33
> tristate "Holtek Ht16K33 LED controller with keyscan"
> depends on FB && OF && I2C && INPUT
> + select FB_SYS_FOPS
> select INPUT_MATRIXKMAP
> select FB_BACKLIGHT
> help
Regards,
Robin
