diff options
| author | Chris Redpath <chris.redpath@arm.com> | 2012-07-12 12:33:13 +0100 |
|---|---|---|
| committer | Jon Medhurst <tixy@linaro.org> | 2014-03-31 13:58:09 +0100 |
| commit | f2f662336fed53bb7a34d422bcd0cdd3a896f837 (patch) | |
| tree | 21e81762b9819917a34c222ea079bcb466d40c8d | |
| parent | d81ef6e2c92174b65e1c6af80d05cddfc0c4e7a1 (diff) | |
ARM HDLCD: Add developer option to remove double-height framebuffers
This option can be used with Android to push the graphics subsystem into a
different composition strategy which is more effective when used on hardware
where the framebuffer memory is not cacheable.
Signed-off-by: Chris Redpath <chris.redpath@arm.com>
| -rw-r--r-- | drivers/video/arm-hdlcd.c | 8 | ||||
| -rw-r--r-- | include/linux/arm-hdlcd.h | 4 |
2 files changed, 12 insertions, 0 deletions
diff --git a/drivers/video/arm-hdlcd.c b/drivers/video/arm-hdlcd.c index f16bb882e0c..9600c70209b 100644 --- a/drivers/video/arm-hdlcd.c +++ b/drivers/video/arm-hdlcd.c @@ -205,7 +205,11 @@ static int hdlcd_check_var(struct fb_var_screeninfo *var, struct fb_info *info) struct hdlcd_device *hdlcd = to_hdlcd_device(info); int bytes_per_pixel = var->bits_per_pixel / 8; +#ifdef HDLCD_NO_VIRTUAL_SCREEN + var->yres_virtual = var->yres; +#else var->yres_virtual = 2 * var->yres; +#endif if ((var->xres_virtual * bytes_per_pixel * var->yres_virtual) > hdlcd->fb.fix.smem_len) return -ENOMEM; @@ -570,7 +574,11 @@ static int hdlcd_setup(struct hdlcd_device *hdlcd) hdlcd->fb.var.yres, hdlcd->fb.var.bits_per_pixel, hdlcd->fb.mode ? hdlcd->fb.mode->refresh : 60); hdlcd->fb.var.xres_virtual = hdlcd->fb.var.xres; +#ifdef HDLCD_NO_VIRTUAL_SCREEN + hdlcd->fb.var.yres_virtual = hdlcd->fb.var.yres; +#else hdlcd->fb.var.yres_virtual = hdlcd->fb.var.yres * 2; +#endif /* initialise and set the palette */ if (fb_alloc_cmap(&hdlcd->fb.cmap, NR_PALETTE, 0)) { diff --git a/include/linux/arm-hdlcd.h b/include/linux/arm-hdlcd.h index f3f4887ac4f..124995aa34f 100644 --- a/include/linux/arm-hdlcd.h +++ b/include/linux/arm-hdlcd.h @@ -102,6 +102,10 @@ * and /proc/hdlcd_underrun to read the counter */ //#define HDLCD_COUNT_BUFFERUNDERRUNS +/* Restrict height to 1x screen size + * + */ +//#define HDLCD_NO_VIRTUAL_SCREEN struct hdlcd_device { struct fb_info fb; |