From: Eddie James <eajames@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: linux-media@vger.kernel.org, linux-aspeed@lists.ozlabs.org,
openbmc@lists.ozlabs.org, andrew@aj.id.au, mchehab@kernel.org,
joel@jms.id.au, robh+dt@kernel.org, mark.rutland@arm.com,
devicetree@vger.kernel.org, linux-clk@vger.kernel.org,
mturquette@baylibre.com, sboyd@kernel.org,
linux-arm-kernel@lists.infradead.org,
Eddie James <eajames@linux.vnet.ibm.com>
Subject: [PATCH 0/4] media: platform: Add Aspeed Video Engine driver
Date: Wed, 29 Aug 2018 16:09:29 -0500 [thread overview]
Message-ID: <1535576973-8067-1-git-send-email-eajames@linux.vnet.ibm.com> (raw)
The Video Engine (VE) embedded in the Aspeed AST2400 and AST2500 SOCs
can capture and compress video data from digital or analog sources. With
the Aspeed chip acting as a service processor, the Video Engine can
capture the host processor graphics output.
This series adds a V4L2 driver for the VE, providing a read() interface
only. The driver triggers the hardware to capture the host graphics output
and compress it to JPEG format.
Testing on an AST2500 determined that the videobuf/streaming/mmap interface
was significantly slower than the simple read() interface, so I have not
included the streaming part.
It's also possible to use an automatic mode for the VE such that
re-triggering the HW every frame isn't necessary. However this wasn't
reliable on the AST2400, and probably used more CPU anyway due to excessive
interrupts. It was approximately 15% faster.
The series also adds the necessary parent clock definitions to the Aspeed
clock driver, with both a mux and clock divider.
Eddie James (4):
clock: aspeed: Add VIDEO reset index definition
clock: aspeed: Setup video engine clocking
dt-bindings: media: Add Aspeed Video Engine binding documentation
media: platform: Add Aspeed Video Engine driver
.../devicetree/bindings/media/aspeed-video.txt | 23 +
drivers/clk/clk-aspeed.c | 41 +-
drivers/media/platform/Kconfig | 8 +
drivers/media/platform/Makefile | 1 +
drivers/media/platform/aspeed-video.c | 1307 ++++++++++++++++++++
include/dt-bindings/clock/aspeed-clock.h | 1 +
6 files changed, 1379 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/media/aspeed-video.txt
create mode 100644 drivers/media/platform/aspeed-video.c
--
1.8.3.1
next reply other threads:[~2018-08-29 21:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-29 21:09 Eddie James [this message]
2018-08-29 21:09 ` [PATCH 1/4] clock: aspeed: Add VIDEO reset index definition Eddie James
2018-08-31 17:56 ` Stephen Boyd
2018-08-29 21:09 ` [PATCH 2/4] clock: aspeed: Setup video engine clocking Eddie James
2018-08-31 17:56 ` Stephen Boyd
2018-08-31 21:33 ` Joel Stanley
2018-08-29 21:09 ` [PATCH 3/4] dt-bindings: media: Add Aspeed Video Engine binding documentation Eddie James
2018-08-29 21:09 ` [PATCH 4/4] media: platform: Add Aspeed Video Engine driver Eddie James
2018-08-30 0:52 ` Ezequiel Garcia
2018-08-30 15:40 ` Eddie James
2018-09-03 11:40 ` Hans Verkuil
2018-09-13 19:00 ` Eddie James
2018-08-31 17:56 ` [PATCH 0/4] " Stephen Boyd
2018-08-31 19:30 ` Eddie James
2018-09-01 2:46 ` Stephen Boyd
2018-09-03 11:57 ` Hans Verkuil
2018-09-13 19:11 ` Eddie James
2018-09-14 6:56 ` Hans Verkuil
2018-09-14 15:07 ` Eddie James
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