git.armlinux.org.uk/linux.git - Linus' kernel tree

Age	Commit message (Collapse)	Author
2024-11-01	i3c: mipi-i3c-hci: Handle interrupts according to current specifications	Jarkko Nikula
	Current MIPI I3C HCI specification versions pre-1.0, 1.0. 1.1 and 1.2 don't have cascaded interrupt bits for the PIO and DMA (ring headers) in the INTR_STATUS register as implemented currently in the code. Instead bits 9:0 are marked as reserved with unspecified reset value. To my understanding they were planned to be introduced in the version 2 and the original commit 9ad9a52cce28 ("i3c/master: introduce the mipi-i3c-hci driver") was coding ahead according to a draft. With remarks though. This is causing that the DMA handler is not called until at least one reserved bit 7:0 is set in the INTR_STATUS. Since it looks that idea was dropped in later official versions and to make able to handle DMA interrupts on an HW that is implemented according to current specifications call assigned PIO or DMA IO handler unconditionally. While doing so remove cascaded interrupt bit definitions and the mask argument passed to the handler functions. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Link: https://lore.kernel.org/r/20240920144432.62370-3-jarkko.nikula@linux.intel.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2020-11-23	i3c/master: introduce the mipi-i3c-hci driver	Nicolas Pitre
	This adds basic support for hardware implementing the MIPI I3C HCI specification. This driver is currently limited by the capabilities of the I3C subsystem, meaning things like scheduled commands, auto-commands and NCM mode are not yet supported. This supports version 1.0 of the MIPI I3C HCI spec, as well as the imminent release of version 1.1. Support for draft version 2.0 of the spec is also largely included with the caveat that future adjustments to this code are likely as the spec is still a work in progress. This is also lightly tested as actual hardware is still very scarce, even for HCI v1.0. Hence the EXPERIMENTAL tag. Further contributions to this driver are expected once vendor implementations and new I3C devices become available. Signed-off-by: Nicolas Pitre <npitre@baylibre.com> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> Link: https://lore.kernel.org/linux-i3c/20201111220510.3622216-3-nico@fluxnic.net