On 02/01/2017 11:39 AM, Mauro Carvalho Chehab wrote: > Em Tue, 31 Jan 2017 15:16:10 +0000 > Hugues FRUCHET <hugues.fruchet@xxxxxx> escreveu: > >> On 01/30/2017 08:18 PM, Mauro Carvalho Chehab wrote: >>> Em Mon, 30 Jan 2017 17:15:36 -0200 >>> Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx> escreveu: >>> >>>> Em Mon, 9 Jan 2017 14:23:33 +0100 >>>> Hans Verkuil <hverkuil@xxxxxxxxx> escreveu: >>>> >>>>> See the v4 series for details: >>>>> >>>>> https://www.spinics.net/lists/linux-media/msg108737.html >>>>> >>>>> Regards, >>>>> >>>>> Hans >>>>> >>>>> The following changes since commit 40eca140c404505c09773d1c6685d818cb55ab1a: >>>>> >>>>> [media] mn88473: add DVB-T2 PLP support (2016-12-27 14:00:15 -0200) >>>>> >>>>> are available in the git repository at: >>>>> >>>>> git://linuxtv.org/hverkuil/media_tree.git delta >>>>> >>>>> for you to fetch changes up to e6f199d01e7b8bc4436738b6c666fda31b9f3340: >>>>> >>>>> st-delta: debug: trace stream/frame information & summary (2017-01-09 14:16:45 +0100) >>>>> >>>>> ---------------------------------------------------------------- >>>>> Hugues Fruchet (10): >>>>> Documentation: DT: add bindings for ST DELTA >>>>> ARM: dts: STiH410: add DELTA dt node >>>>> ARM: multi_v7_defconfig: enable STMicroelectronics DELTA Support >>>>> MAINTAINERS: add st-delta driver >>>>> st-delta: STiH4xx multi-format video decoder v4l2 driver >>>>> st-delta: add memory allocator helper functions >>>>> st-delta: rpmsg ipc support >>>>> st-delta: EOS (End Of Stream) support >>>>> st-delta: add mjpeg support >>>>> st-delta: debug: trace stream/frame information & summary >>>> >>>> There is something wrong on this driver... even after applying all >>>> patches, it complains that there's a for there that does nothing: >>>> >>>> drivers/media/platform/sti/delta/delta-v4l2.c:322 register_decoders() warn: we never enter this loop >>>> drivers/media/platform/sti/delta/delta-v4l2.c: In function 'register_decoders': >>>> drivers/media/platform/sti/delta/delta-v4l2.c:322:16: warning: comparison of unsigned expression < 0 is always false [-Wtype-limits] >>>> for (i = 0; i < ARRAY_SIZE(delta_decoders); i++) { >>>> ^ >> >> Hi Mauro, >> >> It's strange that you face this warning, code is like that: >> /* registry of available decoders */ >> static const struct delta_dec *delta_decoders[] = { >> #ifdef CONFIG_VIDEO_STI_DELTA_MJPEG >> &mjpegdec, >> #endif >> }; >> >> and MJPEG config is enabled by default: >> config VIDEO_STI_DELTA_MJPEG >> bool "STMicroelectronics DELTA MJPEG support" >> default y >> >> so you should not encounter this warning. >> >> On the other hand, you face issue on line 322 of delta-v4l2.c but in my >> codebase, and also in Hans' git tree >> (git://linuxtv.org/hverkuil/media_tree.git delta), this code is at line 323. > > Well, here I compile everything patch per patch. > >> >> Anyway, in order to prevent such warning even if no decoder are selected >> in config, I have reworked the code in v5 adding a "NULL" >> element at the end of decoder array out of any config switch: >> static const struct delta_dec *delta_decoders[] = { >> #ifdef CONFIG_VIDEO_STI_DELTA_MJPEG >> &mjpegdec, >> #endif >> NULL, >> }; > > That just hides the warning. The real problem here is that, if > someone compiles just the main driver with no decoder drivers, it > will get an useless driver. > > It only makes sense to build VIDEO_STI_DELTA if at least one of > the "daughter" drivers is built. > > Assuming that, on some future, you add a MPEG decoder, I guess the > best way to address it would be to have something like this at the > Kconfig: > > config VIDEO_STI_DELTA > tristate "STMicroelectronics STiH4xx DELTA multi-format video decoder V4L2 driver options" > depends on VIDEO_DEV && VIDEO_V4L2 > depends on ARCH_STI || COMPILE_TEST > depends on HAS_DMA > help > This V4L2 DELTA multi-format video decoder driver > of STMicroelectronics STiH4xx SoC series allow hardware > decoding of various compressed video bitstream format in > raw uncompressed format. > > Use this option to see the decoders available for > such hardware. > > Please notice that the driver will only be built if > at least one of the delta codecs below is selected. > > if VIDEO_STI_DELTA > > config VIDEO_STI_DELTA_MJPEG > bool "STMicroelectronics DELTA MJPEG support" > help > Enables the DELTA driver with MJPEG hardware support. > > To compile this driver as a module, choose M here: > the module will be called st-delta. > > config VIDEO_STI_DELTA_MPEG > bool "STMicroelectronics DELTA MPEG support" > help > Enables the DELTA driver with MPEG hardware support. > > To compile this driver as a module, choose M here: > the module will be called st-delta. > > config VIDEO_STI_DELTA_DRIVER > tristate > depends on VIDEO_STI_DELTA > depends on VIDEO_STI_DELTA_MJPEG | VIDEO_STI_DELTA_MPEG > default VIDEO_STI_DELTA_MJPEG | VIDEO_STI_DELTA_MPEG > select VIDEOBUF2_DMA_CONTIG > select V4L2_MEM2MEM_DEV > select RPMSG > > endif # VIDEO_STI_DELTA > > and change the sti/delta/Makefile to compile the delta driver using > the VIDEO_STI_DELTA_DRIVER symbol: > > obj-$(CONFIG_VIDEO_STI_DELTA_DRIVER) := st-delta.o > st-delta-y := delta-v4l2.o delta-mem.o delta-ipc.o delta-debug.o > > # MJPEG support > st-delta-$(CONFIG_VIDEO_STI_DELTA_MJPEG) += delta-mjpeg-hdr.o > st-delta-$(CONFIG_VIDEO_STI_DELTA_MJPEG) += delta-mjpeg-dec.o > > # MPEG support > st-delta-$(CONFIG_VIDEO_STI_DELTA_MPEG) += delta-mpeg-hdr.o > st-delta-$(CONFIG_VIDEO_STI_DELTA_MPEG) += delta-mpeg-dec.o > Hi Mauro, Thanks for the code, I have implemented it in v6 and reverted the v5 change around adding NULL in delta_decoders array. Many thanks, Hugues. >> >>>> >>>> On a first glance, it seems that the register_decoders() function is >>>> reponsible to register the format decoders that the hardware >>>> recognizes. If so, I suspect that this driver is deadly broken. >>>> >>>> Please be sure that the upstream driver works properly before >>>> submitting it upstream. >>>> >>>> Also, please fix the comments to match the Kernel standard. E. g. >>>> instead of: >>>> >>>> /* guard output frame count: >>>> * - at least 1 frame needed for display >>>> * - at worst 21 >>>> * ( max h264 dpb (16) + >>>> * decoding peak smoothing (2) + >>>> * user display pipeline (3) ) >>>> */ >>>> >>>> It should be: >>>> >>>> /* >>>> * guard output frame count: >>>> * - at least 1 frame needed for display >>>> * - at worst 21 >>>> * ( max h264 dpb (16) + >>>> * decoding peak smoothing (2) + >>>> * user display pipeline (3) ) >>>> */ >>>> >>>> There are several similar occurrences among this patch series. >> >> I apologize for this -unfortunately not raised by checkpatch, I will >> have a look to fix it- >> Multiple lines comments are now fixed in v5. > > You need to enable checkpatch in pedantic mode in order to see those > warnings. > >> >>> >>> Ah, forgot to comment, but it mentions a firmware. Does such firmware >>> reside on some RAM memory? If so, how such firmware is loaded? >> >> Firmware is loaded in coprocessor at system startup by remoteproc framework: >> From "[GIT PULL] STi DT update for v4.11 round 1" >> https://lkml.org/lkml/2017/1/12/525: >> https://kernel.googlesource.com/pub/scm/linux/kernel/git/pchotard/sti/+/sti-dt-for-v4.11/arch/arm/boot/dts/stih407-family.dtsi >> st231_delta: remote-processor { >> compatible = "st,st231-rproc"; >> memory-region = <&delta_reserved>; >> resets = <&softreset STIH407_ST231_DMU_SOFTRESET>; >> reset-names = "sw_reset"; >> clocks = <&clk_s_c0_flexgen CLK_ST231_DMU>; >> clock-frequency = <600000000>; >> st,syscfg = <&syscfg_core 0x224>; >> #mbox-cells = <1>; >> mbox-names = "vq0_rx", "vq0_tx", "vq1_rx", "vq1_tx"; >> mboxes = <&mailbox0 0 0>, <&mailbox3 0 1>, <&mailbox0 0 1>, >> <&mailbox3 0 0>; >> }; > > > Ok. > >> >>> >>>> >>>> Thanks, >>>> Mauro >>>> >>>> Thanks, >>>> Mauro >>> >>> >>> >>> Thanks, >>> Mauro >>> >> >> Thanks for all, >> Hugues. > > > Thanks, > Mauro >-- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
