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drm/nouveau/fbcon: add module parameter to select bits-per-pixel 

Useful for debugging.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2018-01-12 17:50:37 +10:00
parent 2c5ac5ba4f
commit 27cda22332
1 changed files with 14 additions and 8 deletions
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22
drivers/gpu/drm/nouveau/nouveau_fbcon.c
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@ -56,6 +56,10 @@ MODULE_PARM_DESC(nofbaccel, "Disable fbcon acceleration");
int nouveau_nofbaccel = 0;
module_param_named(nofbaccel, nouveau_nofbaccel, int, 0400);
MODULE_PARM_DESC(fbcon_bpp, "fbcon bits-per-pixel (default: auto)");
static int nouveau_fbcon_bpp;
module_param_named(fbcon_bpp, nouveau_fbcon_bpp, int, 0400);
static void
nouveau_fbcon_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
@ -488,7 +492,7 @@ nouveau_fbcon_init(struct drm_device *dev)
{
struct nouveau_drm *drm = nouveau_drm(dev);
struct nouveau_fbdev *fbcon;
int preferred_bpp;
int preferred_bpp = nouveau_fbcon_bpp;
int ret;
if (!dev->mode_config.num_crtc ||
@ -512,13 +516,15 @@ nouveau_fbcon_init(struct drm_device *dev)
if (ret)
goto fini;
if (drm->client.device.info.ram_size <= 32 * 1024 * 1024)
preferred_bpp = 8;
else
if (drm->client.device.info.ram_size <= 64 * 1024 * 1024)
preferred_bpp = 16;
else
preferred_bpp = 32;
if (preferred_bpp != 8 && preferred_bpp != 16 && preferred_bpp != 32) {
if (drm->client.device.info.ram_size <= 32 * 1024 * 1024)
preferred_bpp = 8;
else
if (drm->client.device.info.ram_size <= 64 * 1024 * 1024)
preferred_bpp = 16;
else
preferred_bpp = 32;
}
/* disable all the possible outputs/crtcs before entering KMS mode */
if (!drm_drv_uses_atomic_modeset(dev))