Hi Tomi, On Fri, Jan 29, 2016 at 10:20 AM, Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote: > > > On 19/01/16 15:10, Fabio Estevam wrote: >> From: Fabio Estevam <fabio.estevam@xxxxxxx> >> >> Currently when we boot the kernel on a mx25pdk the LCDC controller >> does not show the Linux logo on boot. >> >> This problem is well explained by Sascha Hauer: >> >> "Unfortunately this LCD controller does not have an enable bit. The >> controller starts directly when the clocks are enabled. If the clocks >> are enabled when the controller is not yet programmed with proper >> register values then it just goes into some undefined state. What I >> suspect is that the clocks already were enabled before driver probe, >> presumably by the bootloader, so the controller is already in undefined >> state when entering Linux. Now by dis/enabling the ipg clock you >> effectively reset the controller. Since you have programmed it with >> valid register values in the mean time it starts working after this >> reset." >> >> So do as suggested and force a reset of the LCDC hardware by >> enabling and disabling the IPG clock. >> >> With this change the Linux logo can be seen on boot on a mx25pdk. >> >> Signed-off-by: Fabio Estevam <fabio.estevam@xxxxxxx> >> --- >> drivers/video/fbdev/imxfb.c | 15 +++++++++++++++ >> 1 file changed, 15 insertions(+) > > Thanks. Queued for 4.5 fixes. Still don't see this one applied in Linus nor linux-next tree yet. -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
