3 commits

Author	SHA1	Message	Date
Orson Zhai	cadbba5ec8	mailbox: sprd: Introduce refcnt when clients requests/free channels ... [ Upstream commit 9468ab8403 ] 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: ca27fc26cd ("mailbox: sprd: Add Spreadtrum mailbox driver") Signed-off-by: Orson Zhai <orson.zhai@unisoc.com> Reviewed-by: Baolin Wang <baolin.wang7@gmail.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>	2021-05-14 09:50:27 +02:00
Magnum Shan	37aba9cfec	mailbox: sprd: correct definition of SPRD_OUTBOX_FIFO_FULL ... [ Upstream commit 4450f128c5 ] According to the specification, bit[2] represents SPRD_OUTBOX_FIFO_FULL, not bit[0], so correct it. Fixes: ca27fc26cd ("mailbox: sprd: Add Spreadtrum mailbox driver") Signed-off-by: Magnum Shan <magnum.shan@unisoc.com> Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com> Reviewed-by: Baolin Wang <baolin.wang7@gmail.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>	2021-03-04 11:38:15 +01:00
Baolin Wang	ca27fc26cd	mailbox: sprd: Add Spreadtrum mailbox driver ... 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 <baolin.wang@unisoc.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>	2020-05-30 18:05:33 -05:00