Am 06.08.20 um 13:04 schrieb Marek Vasut: > On 8/6/20 12:53 PM, Wolfgang Grandegger wrote: >> This reverts commit c5f4b805755912a3d2fe20f014b6b6ab0473bd73. >> >> Conflicts: >> arch/arm/mach-socfpga/misc_gen5.c >> >> Without socfpga_sdram_apply_static_cfg(), the system hangs when Linux >> calls altvipfb2_start_hw() of the Intel Video and Image Processing(VIP) >> Frame Buffer II driver (drivers/video/fbdev/altvipfb2.c) > > There is no such driver in mainline U-Boot or Linux.
It's a simple frame buffer driver from linux-socfpga for the IP core Intel Video and Image Processing(VIP) Frame Buffer II. It actually hangs here when the streaming starts: https://github.com/altera-opensource/linux-socfpga/blob/socfpga-5.4.44-lts/drivers/video/fbdev/altvipfb2.c#L69 I can also hang the system if I setup and start the FB with just a few U-Boot commands. I think the system hangs when the IP core starts reading the FB data from the system memory. >> , but only >> after a power cycle (cold boot). The issue does not show up after a >> soft reset (warm boot) and with v2018.11. > > See the commit message of the patch this is reverting, I believe there > is a deeper issue with the static config register. Can you investigate? I read the commit message, but well, I can't follow all the details :(. On the other hand, it seems also not clear why the fix was added. Any idea what to investigate. Wolfgang
