From patchwork Wed Oct 13 10:56:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dafna Hirschfeld X-Patchwork-Id: 12555541 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E457EC433FE for ; Wed, 13 Oct 2021 10:56:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D0DE4610E6 for ; Wed, 13 Oct 2021 10:56:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233774AbhJMK64 (ORCPT ); Wed, 13 Oct 2021 06:58:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56460 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232260AbhJMK6Z (ORCPT ); Wed, 13 Oct 2021 06:58:25 -0400 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 555EDC06176A; Wed, 13 Oct 2021 03:56:22 -0700 (PDT) Received: from guri.fritz.box (unknown [IPv6:2a02:810a:880:f54:2d05:985b:ed8c:969a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: dafna) by bhuna.collabora.co.uk (Postfix) with ESMTPSA id B96171F4417C; Wed, 13 Oct 2021 11:56:20 +0100 (BST) From: Dafna Hirschfeld To: linux-media@vger.kernel.org Cc: Dafna Hirschfeld , Robert Beckett , Mauro Carvalho Chehab , Greg Kroah-Hartman , linux-staging@lists.linux.dev (open list:STAGING SUBSYSTEM), linux-kernel@vger.kernel.org (open list), laurent.pinchart@ideasonboard.com, hverkuil@xs4all.nl, kernel@collabora.com, dafna3@gmail.com, kiril.bicevski@collabora.com, Nas Chung , lafley.kim@chipsnmedia.com, scott.woo@chipsnmedia.com, olivier.crete@collabora.com Subject: [PATCH v2 4/6] staging: media: wave5: Add TODO file Date: Wed, 13 Oct 2021 12:56:07 +0200 Message-Id: <20211013105609.21457-5-dafna.hirschfeld@collabora.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211013105609.21457-1-dafna.hirschfeld@collabora.com> References: <20211013105609.21457-1-dafna.hirschfeld@collabora.com> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add a TODO file listing all that is need for destaging. Signed-off-by: Robert Beckett Signed-off-by: Dafna Hirschfeld --- drivers/staging/media/wave5/TODO | 58 ++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 drivers/staging/media/wave5/TODO diff --git a/drivers/staging/media/wave5/TODO b/drivers/staging/media/wave5/TODO new file mode 100644 index 000000000000..3a2c94389c44 --- /dev/null +++ b/drivers/staging/media/wave5/TODO @@ -0,0 +1,58 @@ +* Test on real silicon once available + + This driver has so far been tested on pre-silicon FPGA and on the beta BeagleV + board which uses the StarFive JH7100 beta SoC. + + Testing on FPGA shows it working fine, though the FPGA uses polled interrupts + and copied buffers between the host and it's on board RAM. + + Testing on BeagleV shows buffer corruption that is currently attributed to a + known silicon issue in the SoC that makes the cache coherent interconnect not + so coherent. + This can likely be solved when the riscv non-coherent dma support lands and + provide optional v4l2 non-contiguous allocator, though it remains to be seen + whether support non-coherent use cases will be useful in real world hw. + + Until we can test and resolve any issues on final silicon (due 2H 2021) + this driver should remain in staging. + +* Handle interrupts better + + Currently the interrupt handling uses an unusual design employing a kfifo to + transfer irq status to irq thread. This was done as a work around for dropped + interrupts seen with IRQF_ONESHOT based handling. + + This needs further investigation and fixing properly, with the aid of + C&M and StarFive engineers. + +* Fix early end of stream handling + + When using a gstreamer pipeline like this: + gst-launch-1.0 filesrc location= ! parsebin ! h264parse ! v4l2h264dec ! jpegenc ! identity eos-after=3 ! multifilesink location=%05d.jpeg + i.e. forced eos after 3 buffers + the pipeline stalls on exit waiting for end of job. + We need to add some form of early exit detection, instead of the current + behaviour of only considering a job finish on PIC_END. + +* Support more formats + + The current frontend v4l2 layer only supports V4L2_PIX_FMT_HEVC and + V4L2_PIX_FMT_H264. + The backend logic supports other formats, so we should wire up the support + for further bitsream formats. + +* appropreate error handling: +allocation failure, mutex acquire failure etc. + +* remove all unused struct fields + +* change struct fields to 'bool' type or bitfield when appropreate +Likely good candidates are fields named '*_enable' , '*_on' + +* handle vdi_allocate_dma_memory failure , each function has to clean after itself + +* make sure that 'u32', 's32' etc. are only used when reading/writing hw + +* power management handling - add (runtime_)suspen/resume cb where the clock is enabled + +* fix checkpatch issues (mostly fixes , only left to fix MACRO_ARG_REUSE, LONG_LINE)