Linux kernel stable tree (mirror) https://git.radix-linux.su/kernel/linux.git/atom?h=v6.6.132 2021-11-01T09:26:48+00:00 2021-11-01T09:26:48+00:00 Viresh Kumar viresh.kumar@linaro.org 2021-10-21T09:47:49+00:00 urn:sha1:dcce162559ee1ce5f64992c4c65197f9270e3d4f The virtio specification received a new mandatory feature (VIRTIO_I2C_F_ZERO_LENGTH_REQUEST) for zero length requests. Fail if the feature isn't offered by the device. For each read-request, set the VIRTIO_I2C_FLAGS_M_RD flag, as required by the VIRTIO_I2C_F_ZERO_LENGTH_REQUEST feature. This allows us to support zero length requests, like SMBUS Quick, where the buffer need not be sent anymore. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Link: https://lore.kernel.org/r/7c58868cd26d2fc4bd82d0d8b0dfb55636380110.1634808714.git.viresh.kumar@linaro.org Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jie Deng <jie.deng@intel.com> # once the spec is merged 2021-08-19T19:21:19+00:00 Jie Deng jie.deng@intel.com 2021-07-23T05:44:35+00:00 urn:sha1:3cfc88380413d20f777dc6648a38f683962e52bf Add an I2C bus driver for virtio para-virtualization. The controller can be emulated by the backend driver in any device model software by following the virtio protocol. The device specification can be found on https://lists.oasis-open.org/archives/virtio-comment/202101/msg00008.html. By following the specification, people may implement different backend drivers to emulate different controllers according to their needs. Co-developed-by: Conghui Chen <conghui.chen@intel.com> Signed-off-by: Conghui Chen <conghui.chen@intel.com> Signed-off-by: Jie Deng <jie.deng@intel.com> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Tested-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>