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This bug affects all of Hauppauge QuadHD boards when used on all Ryzen platforms and some XEON platforms. On these platforms it is possible to error out the RiSC engine and cause it to stall, whereafter the only way to reset the board to a working state is to reboot. This is the fatal condition with current driver: [ 255.663598] cx23885: cx23885[0]: mpeg risc op code error [ 255.663607] cx23885: cx23885[0]: TS1 B - dma channel status dump [ 255.663612] cx23885: cx23885[0]: cmds: init risc lo : 0xffe54000 [ 255.663615] cx23885: cx23885[0]: cmds: init risc hi : 0x00000000 [ 255.663619] cx23885: cx23885[0]: cmds: cdt base : 0x00010870 [ 255.663622] cx23885: cx23885[0]: cmds: cdt size : 0x0000000a [ 255.663625] cx23885: cx23885[0]: cmds: iq base : 0x00010630 [ 255.663629] cx23885: cx23885[0]: cmds: iq size : 0x00000010 [ 255.663632] cx23885: cx23885[0]: cmds: risc pc lo : 0xffe54018 [ 255.663636] cx23885: cx23885[0]: cmds: risc pc hi : 0x00000000 [ 255.663639] cx23885: cx23885[0]: cmds: iq wr ptr : 0x00004192 [ 255.663642] cx23885: cx23885[0]: cmds: iq rd ptr : 0x0000418c [ 255.663645] cx23885: cx23885[0]: cmds: cdt current : 0x00010898 [ 255.663649] cx23885: cx23885[0]: cmds: pci target lo : 0xf85ca340 [ 255.663652] cx23885: cx23885[0]: cmds: pci target hi : 0x00000000 [ 255.663655] cx23885: cx23885[0]: cmds: line / byte : 0x000c0000 [ 255.663659] cx23885: cx23885[0]: risc0: [ 255.663661] 0x1c0002f0 [ write sol eol count=752 ] [ 255.663666] cx23885: cx23885[0]: risc1: [ 255.663667] 0xf85ca050 [ INVALID sol 22 20 19 18 resync 13 count=80 ] [ 255.663674] cx23885: cx23885[0]: risc2: [ 255.663674] 0x00000000 [ INVALID count=0 ] [ 255.663678] cx23885: cx23885[0]: risc3: [ 255.663679] 0x1c0002f0 [ write sol eol count=752 ] [ 255.663684] cx23885: cx23885[0]: (0x00010630) iq 0: [ 255.663685] 0x1c0002f0 [ write sol eol count=752 ] [ 255.663690] cx23885: cx23885[0]: iq 1: 0xf85ca630 [ arg #1 ] [ 255.663693] cx23885: cx23885[0]: iq 2: 0x00000000 [ arg #2 ] [ 255.663696] cx23885: cx23885[0]: (0x0001063c) iq 3: [ 255.663697] 0x1c0002f0 [ write sol eol count=752 ] [ 255.663702] cx23885: cx23885[0]: iq 4: 0xf85ca920 [ arg #1 ] [ 255.663705] cx23885: cx23885[0]: iq 5: 0x00000000 [ arg #2 ] [ 255.663709] cx23885: cx23885[0]: (0x00010648) iq 6: [ 255.663709] 0xf85ca340 [ INVALID sol 22 20 19 18 resync 13 count=832 ] [ 255.663716] cx23885: cx23885[0]: (0x0001064c) iq 7: [ 255.663717] 0x00000000 [ INVALID count=0 ] [ 255.663721] cx23885: cx23885[0]: (0x00010650) iq 8: [ 255.663721] 0x00000000 [ INVALID count=0 ] [ 255.663725] cx23885: cx23885[0]: (0x00010654) iq 9: [ 255.663726] 0x1c0002f0 [ write sol eol count=752 ] [ 255.663731] cx23885: cx23885[0]: iq a: 0xf85c9780 [ arg #1 ] [ 255.663734] cx23885: cx23885[0]: iq b: 0x00000000 [ arg #2 ] [ 255.663737] cx23885: cx23885[0]: (0x00010660) iq c: [ 255.663738] 0x1c0002f0 [ write sol eol count=752 ] [ 255.663743] cx23885: cx23885[0]: iq d: 0xf85c9a70 [ arg #1 ] [ 255.663746] cx23885: cx23885[0]: iq e: 0x00000000 [ arg #2 ] [ 255.663749] cx23885: cx23885[0]: (0x0001066c) iq f: [ 255.663750] 0x1c0002f0 [ write sol eol count=752 ] [ 255.663755] cx23885: cx23885[0]: iq 10: 0xf4fa2920 [ arg #1 ] [ 255.663758] cx23885: cx23885[0]: iq 11: 0x00000000 [ arg #2 ] [ 255.663759] cx23885: cx23885[0]: fifo: 0x00005000 -> 0x6000 [ 255.663760] cx23885: cx23885[0]: ctrl: 0x00010630 -> 0x10690 [ 255.663764] cx23885: cx23885[0]: ptr1_reg: 0x00005980 [ 255.663767] cx23885: cx23885[0]: ptr2_reg: 0x000108a8 [ 255.663770] cx23885: cx23885[0]: cnt1_reg: 0x0000000b [ 255.663773] cx23885: cx23885[0]: cnt2_reg: 0x00000003 Included is checks of the TC_REQ and TC_REQ_SET registers during states of board initialization, reset, DMA start, and DMA stop. If both registers are set, this indicates a stall in the RiSC engine, at which point the bridge error is cleared. A small delay is introduced in stop_dma as well, to allow transfers in progress to finish. After application all models work on Ryzen, occasionally yielding: cx23885_clear_bridge_error: dma in progress detected 0x00000001 0x00000001, clearing Signed-off-by: Brad Love <brad@nextdimension.cc> Signed-off-by: Hans Verkuil <hansverk@cisco.com> [hansverk@cisco.com: fix compiler warning of unused 'reg' variable] Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.