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We don't have to create a separate sdio.xmit_buf buffer for each queue. Instead, we just need to create one, reuse it across all queues to reduce memory consumption further. And then we should take it into account the actual the host and the device MMC capability to determine what the appropriate xmit_buf_size can be. Both MT7921S and MT7663 can support up to Tx FIFO size of 0x3fe00 which means the device can receive 511 blocks of block size 512 in a row from the host. So if the driver aggregates the frames as many as possible the the device can support, we can merge multiple MMC requests into a single one to get rid of the overhead of the handling and synchronizing in those unnecessary MMC requests and reduce the SDIO lock contention with the Bluetooth concurrent traffic and finally to have the higher bus utilization with less idle cycle. With the patch, it is helpful for WiFi to have steady throughput performance especially while running Bluetooth concurrently. Co-developed-by: Deren Wu <deren.wu@mediatek.com> Signed-off-by: Deren Wu <deren.wu@mediatek.com> Signed-off-by: Sean Wang <sean.wang@mediatek.com> Acked-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Felix Fietkau <nbd@nbd.name>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.