Hi Linus. On Sun, Jun 14, 2020 at 12:30:26AM +0200, Linus Walleij wrote: > The following bug appeared in the MCDE driver/display > initialization during the recent merge window. > > First the place we call drm_fbdev_generic_setup() in the > wrong place: this needs to be called AFTER calling > drm_dev_register() else we get this splat: > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 1 at ../drivers/gpu/drm/drm_fb_helper.c:2198 > drm_fbdev_generic_setup+0x164/0x1a8 > mcde a0350000.mcde: Device has not been registered. > Modules linked in: > Hardware name: ST-Ericsson Ux5x0 platform (Device Tree Support) > [<c010e704>] (unwind_backtrace) from [<c010a86c>] (show_stack+0x10/0x14) > [<c010a86c>] (show_stack) from [<c0414f38>] (dump_stack+0x9c/0xb0) > [<c0414f38>] (dump_stack) from [<c0121c8c>] (__warn+0xb8/0xd0) > [<c0121c8c>] (__warn) from [<c0121d18>] (warn_slowpath_fmt+0x74/0xb8) > [<c0121d18>] (warn_slowpath_fmt) from [<c04b154c>] > (drm_fbdev_generic_setup+0x164/0x1a8) > [<c04b154c>] (drm_fbdev_generic_setup) from [<c04ed278>] > (mcde_drm_bind+0xc4/0x160) > [<c04ed278>] (mcde_drm_bind) from [<c04f06b8>] > (try_to_bring_up_master+0x15c/0x1a4) > (...) > > Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
Yup, this is the right way to do it. Reviewed-by: Sam Ravnborg <s...@ravnborg.org> One small thing to consider, see below. But for another patch. > --- > drivers/gpu/drm/mcde/mcde_drv.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/mcde/mcde_drv.c b/drivers/gpu/drm/mcde/mcde_drv.c > index 84f3e2dbd77b..80082d6dce3a 100644 > --- a/drivers/gpu/drm/mcde/mcde_drv.c > +++ b/drivers/gpu/drm/mcde/mcde_drv.c > @@ -209,7 +209,6 @@ static int mcde_modeset_init(struct drm_device *drm) > > drm_mode_config_reset(drm); > drm_kms_helper_poll_init(drm); > - drm_fbdev_generic_setup(drm, 32); > > return 0; > } > @@ -264,6 +263,8 @@ static int mcde_drm_bind(struct device *dev) > if (ret < 0) > goto unbind; > > + drm_fbdev_generic_setup(drm, 32); Consider using mode_config.preferred_depth, then you can pass 0 here. > + > return 0; > > unbind: > -- > 2.26.2 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
