Hi Simon, On Thu, Oct 3, 2013 at 7:51 PM, Simon Glass <s...@chromium.org> wrote:
> Hi, > > On Thu, Oct 3, 2013 at 3:24 AM, Ajay kumar <ajayn...@gmail.com> wrote: > > +Simon Glass > > > > > > On Thu, Oct 3, 2013 at 2:25 PM, Albert ARIBAUD < > albert.u.b...@aribaud.net> > > wrote: > >> > >> Hi Ajay, > >> > >> On Thu, 03 Oct 2013 14:34:20 +0530, Ajay Kumar > >> <ajaykumar...@samsung.com> wrote: > >> > >> > If the exynos display controller is still active when Linux starts, > >> > then it will result in a kernel panic while FIMD sysmmu driver is > >> > getting probed. > >> > Calling exynos_fimd_lcd_disable() before jumping into kernel > >> > disables the display controller by switching off the windows, > >> > hence resolving the kernel panic which arises from sysmmu driver. > >> > > >> > Create an Exynos specific definition for the weak function > >> > arch_cleanup_before_linux(), and then place the call to > >> > exynos_fimd_lcd_disable() inside the overrided definition of > >> > arch_cleanup_before_linux(). > >> > > >> > Signed-off-by: Ajay Kumar <ajaykumar...@samsung.com> > >> > Signed-off-by: Simon Glass <s...@chromium.org> > >> > --- > >> > >> Why should the fix to this situation be making U-Boot disable the > >> display controller rather than making Linux able to cope with an > >> already active display controller? > >> > >> Besides, fixing Linux would allow seamless booting displays, without an > >> ugly off-on glitch. > > Yes, I believe this bug was fixed in Linux - Ajay do you know? Perhaps > the fix has not been upstreamed yet? > > Regards, > Simon > > You are right. I found it. http://permalink.gmane.org/gmane.comp.video.dri.devel/78840 This patch would be resent in next series of iommu patches. So, we would not need the u-boot patch anymore! > >> > >> Amicalement, > >> -- > >> Albert. > >> _______________________________________________ > >> U-Boot mailing list > >> U-Boot@lists.denx.de > >> http://lists.denx.de/mailman/listinfo/u-boot > > > > > Thanks and regards, Ajay Kumar
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