On Wed, 2019-03-06 at 15:02 +0100, Maxime Ripard wrote:

The preferred bpp for the fbdev emulation buffer has been 32 so far, which means that by default we will allocate an 8MB buffer with a 1920x1080 resolution.

Worse this memory will be allocated from the CMA pool, and will never be freed even if we don't use the fbdev emulation. Therefore, reducing it is a big deal, and switching to 16bpp by default will gain us around 4MB at 1920x1080, while keeping decent color depth. And users still have the option to switch to 32bpp using the kernel command line.

Signed-off-by: Maxime Ripard maxime.ripard@bootlin.com

Reviewed-by: Paul Kocialkowski paul.kocialkowski@bootlin.com

Cheers,

Paul

---

drivers/gpu/drm/vc4/vc4_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c index 52576dee809e..c38cf64837e1 100644 --- a/drivers/gpu/drm/vc4/vc4_drv.c +++ b/drivers/gpu/drm/vc4/vc4_drv.c @@ -286,7 +286,7 @@ static int vc4_drm_bind(struct device *dev)

vc4_kms_load(drm);

• drm_fbdev_generic_setup(drm, 32);

• drm_fbdev_generic_setup(drm, 16);

  return 0;