da49a8075c
Add FLEXCAN_QUIRK_BROKEN_PERR_STATE for better description of the missing error passive interrupt quirk. Error interrupt flooding may happen if the broken error state quirk fix is enabled. For example, in case there is singled out node on the bus and the node sends a frame, then error interrupt flooding happens and will not stop because the node cannot go to bus off. The flooding will stop after another node connected to the bus again. If high bitrate configured on the low end system, then the flooding may causes performance issue, hence, this patch mitigates this by: 1. disable error interrupt upon error passive state transition 2. re-enable error interrupt upon error warning state transition 3. disable/enable error interrupt upon error active state transition depends on FLEXCAN_QUIRK_BROKEN_WERR_STATE In this way, the driver is still able to report correct state transitions without additional latency. When there are bus problems, flooding of error interrupts is limited to the number of frames required to change state from error warning to error passive if the core has [TR]WRN_INT connected (FLEXCAN_QUIRK_BROKEN_WERR_STATE is not enabled), otherwise, the flooding is limited to the number of frames required to change state from error active to error passive. Signed-off-by: Zhu Yi <yi.zhu5@cn.bosch.com> Signed-off-by: Mark Jonas <mark.jonas@de.bosch.com> Acked-by: Wolfgang Grandegger <wg@grandegger.com> Cc: linux-stable <stable@vger.kernel.org> # >= v4.11 Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> |
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| block | ||
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| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
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| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.