Hello Pankaj, On 12/16/2016 08:48 AM, Pankaj Dubey wrote: > From: Smitha T Murthy <smitha.t@xxxxxxxxxxx> > > It has been observed on ARM64 based Exynos SoC, if IOMMU is not enabled > and we try to use reserved memory for MFC, reqbufs fails with below > mentioned error > --------------------------------------------------------------------------- > V4L2 Codec decoding example application > Kamil Debski <k.debski@xxxxxxxxxxx> > Copyright 2012 Samsung Electronics Co., Ltd. > > Opening MFC. > (mfc.c:mfc_open:58): MFC Info (/dev/video0): driver="s5p-mfc" \ > bus_info="platform:12c30000.mfc0" card="s5p-mfc-dec" fd=0x4[ > 42.339165] Remapping memory failed, error: -6 > > MFC Open Success. > (main.c:main:711): Successfully opened all necessary files and devices > (mfc.c:mfc_dec_setup_output:103): Setup MFC decoding OUTPUT buffer \ > size=4194304 (requested=4194304) > (mfc.c:mfc_dec_setup_output:120): Number of MFC OUTPUT buffers is 2 \ > (requested 2) > > [App] Out buf phy : 0x00000000, virt : 0xffffffff > Output Length is = 0x300000 > Error (mfc.c:mfc_dec_setup_output:145): Failed to MMAP MFC OUTPUT buffer > ------------------------------------------------------------------------- > This is because the device requesting for memory is mfc0.left not the parent mfc0. > Hence setting of alloc_devs need to be done only if IOMMU is enabled > and in that case both the left and right device is treated as mfc0 only. > I see, so likely you were facing the issue described in patch 1/2 after this patch since the driver doesn't set alloc_devs when IOMMU is disabled, right? In any case, I guess these patches have been superseded by Marek's series[0] so they are no longer needed? [0]: https://www.spinics.net/lists/linux-media/msg111156.html Best regards, -- Javier Martinez Canillas Open Source Group Samsung Research America
