kernel/linux.git/drivers/mailbox/sprd-mailbox.c, branch linux-7.1.y

mailbox: sprd: mask interrupts that are not handled

2026-02-02T00:59:52+00:00

To reduce the amount of spurious interrupts, disable the interrupts that are not handled in this driver. Signed-off-by: Otto Pflüger Signed-off-by: Jassi Brar

mailbox: sprd: add support for mailbox revision 2

2026-02-02T00:59:49+00:00

Newer Unisoc SoCs such as UMS9230 include a new revision of the mailbox IP with support for up to 16 channels. Since the new revision has a similar register layout and many parts have remained unchanged, make the driver support both revisions. Signed-off-by: Otto Pflüger Signed-off-by: Jassi Brar

mailbox: sprd: clear delivery flag before handling TX done

2026-02-02T00:59:33+00:00

If there are any pending messages in the mailbox queue, they are sent as soon as a TX done event arrives from the driver. This may trigger a new delivery interrupt while the previous one is still being handled. If the delivery status is cleared after this, the interrupt is lost. To prevent this from happening, clear the delivery status immediately after checking it and before any new messages are sent. Signed-off-by: Otto Pflüger Signed-off-by: Jassi Brar

mailbox: sprd: Use devm_clk_get_enabled() helpers

2024-09-23T00:19:17+00:00

The devm_clk_get_enabled() helpers: - call devm_clk_get() - call clk_prepare_enable() and register what is needed in order to call clk_disable_unprepare() when needed, as a managed resource. This simplifies the code and avoids the calls to clk_disable_unprepare(). Due to clk only used in probe, not in suspend\resume, this pointer can remove from sprd_mbox_priv to save a little memory. Signed-off-by: Huan Yang Reviewed-by: Christophe JAILLET Reviewed-by: Baolin Wang Signed-off-by: Jassi Brar

mailbox: Explicitly include correct DT includes

2023-09-05T15:10:58+00:00

The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring Signed-off-by: Jassi Brar

mailbox: sprd: Add supplementary inbox support

2021-04-14T01:07:36+00:00

Some sensors connected to Unisoc mailbox will send data very frequently. This makes channel 0 very busy and the messages from other remote cores not able to be handled as soon as possible. It's a trick (un-documented) from Unisoc ASIC designers to resolve this special requirement that an inbox assigned to one of the remote cores before was modified to be exposed to host cpu core. Then from host side, a supplementary inbox is added for transferring mass but not emergency messages from the remote cores, such as step counting sensor, with an independent FIFO and interrupt which is as same as channel 0. Meanwihle, inbox part of this channel is still kept for original remote core to use. Signed-off-by: Orson Zhai Reviewed-by: Baolin Wang Signed-off-by: Jassi Brar

mailbox: sprd: Introduce refcnt when clients requests/free channels

2021-04-14T01:07:36+00:00

Unisoc mailbox has no way to be enabled/disabled for any single channel. They can only be set to startup or shutdown as a whole device at same time. Add a variable to count references to avoid mailbox FIFO being reset unexpectedly when clients are requesting or freeing channels. Also add a lock to dismiss possible conflicts from register r/w in different startup or shutdown threads. And fix the crash problem when early interrupts come from channel which has not been requested by client yet. Fixes: ca27fc26cd22 ("mailbox: sprd: Add Spreadtrum mailbox driver") Signed-off-by: Orson Zhai Reviewed-by: Baolin Wang Signed-off-by: Jassi Brar

mailbox: fix various typos in comments

2021-04-14T01:07:35+00:00

Fix trivial typos in mailbox driver comments. s/Intergrated/Integrated/ s/extenstion/extension/ s/atleast/at least/ s/commnunication/communication/ s/assgined/assigned/ s/commnunication/communication/ s/recevied/received/ s/succeded/succeeded/ s/implmentation/implementation/ s/definiation/definition/ s/traget/target/ s/wont/won't/ Cc: trivial@kernel.org Signed-off-by: Tom Saeger Reviewed-by: Randy Dunlap Signed-off-by: Jassi Brar

mailbox: sprd: correct definition of SPRD_OUTBOX_FIFO_FULL

2021-02-15T05:28:20+00:00

According to the specification, bit[2] represents SPRD_OUTBOX_FIFO_FULL, not bit[0], so correct it. Fixes: ca27fc26cd22 ("mailbox: sprd: Add Spreadtrum mailbox driver") Signed-off-by: Magnum Shan Signed-off-by: Chunyan Zhang Reviewed-by: Baolin Wang Signed-off-by: Jassi Brar

mailbox: sprd: Add Spreadtrum mailbox driver

2020-05-30T23:05:33+00:00

The Spreadtrum mailbox controller supports 8 channels to communicate with MCUs, and it contains 2 different parts: inbox and outbox, which are used to send and receive messages by IRQ mode. Signed-off-by: Baolin Wang Signed-off-by: Jassi Brar