linux-stable.git/drivers/mailbox, branch v5.7.7

mailbox: imx: Add context save/restore for suspend/resume

2020-06-24T15:49:07+00:00

[ Upstream commit ba5f9fa0ca85a6137fa35efd3a1256d8bb6bc5ff ]

For "mem" mode suspend on i.MX8 SoCs, MU settings could be
lost because its power is off, so save/restore is needed
for MU settings during suspend/resume. However, the restore
can ONLY be done when MU settings are actually lost, for the
scenario of settings NOT lost in "freeze" mode suspend, since
there could be still IPC going on multiple CPUs, restoring the
MU settings could overwrite the TIE by mistake and cause system
freeze, so need to make sure ONLY restore the MU settings when
it is powered off, Anson fixes this by checking whether restore
is actually needed when resume.

Signed-off-by: Dong Aisheng 
Signed-off-by: Anson Huang 
Signed-off-by: Jassi Brar 
Signed-off-by: Sasha Levin

mailbox: zynqmp-ipi: Fix NULL vs IS_ERR() check in zynqmp_ipi_mbox_probe()

2020-06-24T15:49:01+00:00

[ Upstream commit 445aeeb569f8d7904f8cf80b7c6826bb651ef80e ]

In case of error, the function devm_ioremap() returns NULL pointer not
ERR_PTR(). So we should check whether the return value of devm_ioremap()
is NULL instead of IS_ERR.

Fixes: 4981b82ba2ff ("mailbox: ZynqMP IPI mailbox controller")
Signed-off-by: Wei Yongjun 
Signed-off-by: Jassi Brar 
Signed-off-by: Sasha Levin

mailbox: imx: Fix return in imx_mu_scu_xlate()

2020-06-24T15:49:01+00:00

[ Upstream commit 1b3a347b7d56aa637157da1b7df225071af1421f ]

This called from mbox_request_channel().  The caller is  expecting error
pointers and not NULL so this "return NULL;" will lead to an Oops.

Fixes: 0a67003b1985 ("mailbox: imx: add SCU MU support")
Signed-off-by: Dan Carpenter 
Signed-off-by: Jassi Brar 
Signed-off-by: Sasha Levin

mailbox: imx: add SCU MU support

2020-03-20T04:04:32+00:00

i.MX8/8X SCU MU is dedicated for communication between SCU and Cortex-A
cores from hardware design, and could not be reused for other purpose.

Per i.MX8/8X Reference mannual, Chapter "12.9.2.3.2 Messaging Examples",
 Passing short messages: Transmit register(s) can be used to pass
 short messages from one to four words in length. For example, when
 a four-word message is desired, only one of the registers needs to
 have its corresponding interrupt enable bit set at the receiver side;
 the message’s first three words are written to the registers whose
 interrupt is masked, and the fourth word is written to the other
 register (which triggers an interrupt at the receiver side).

i.MX8/8X SCU firmware IPC is an implementation of passing short
messages. But current imx-mailbox driver only support one word
message, i.MX8/8X linux side firmware has to request four TX
and four RX to support IPC to SCU firmware. This is low efficent
and more interrupts triggered compared with one TX and
one RX.

To make SCU MU work,
  - parse the size of msg.
  - Only enable TR0/RR0 interrupt for transmit/receive message.
  - For TX/RX, only support one TX channel and one RX channel
  - For RX, support receive msg larger than 4 u32 words.
  - Support 6 channels, TX0/RX0/RXDB[0-3], not support TXDB.

Reviewed-by: Oleksij Rempel 
Signed-off-by: Peng Fan 
Signed-off-by: Jassi Brar

mailbox: imx: restructure code to make easy for new MU

2020-03-20T04:03:11+00:00

Add imx_mu_generic_tx for data send and imx_mu_generic_rx for interrupt
data receive.

Pack original mu chans related code into imx_mu_init_generic

Add tx/rx/init hooks into imx_mu_dcfg

With these, it will be a bit easy to introduce i.MX8/8X SCU type
MU dedicated to communicate with SCU.

Reviewed-by: Oleksij Rempel 
Signed-off-by: Peng Fan 
Signed-off-by: Jassi Brar

mailbox: mediatek: remove implementation related to atomic_exec

2020-03-20T04:00:32+00:00

After implement flush, client can flush the executing
command buffer or abort the still waiting for event
command buffer, so controller do not need to implement
atomic_exe feature. remove it.

Signed-off-by: Bibby Hsieh 
Reviewed-by: CK Hu 
Signed-off-by: Jassi Brar

mailbox: mediatek: implement flush function

2020-03-20T04:00:32+00:00

For client driver which need to reorganize the command buffer, it could
use this function to flush the send command buffer.
If the channel doesn't be started (usually in waiting for event), this
function will abort it directly.

Signed-off-by: Bibby Hsieh 
Reviewed-by: CK Hu 
Signed-off-by: Jassi Brar

maillbox: bcm-flexrm-mailbox: handle cmpl_pool dma allocation failure

2020-03-20T04:00:32+00:00

Handle 'cmpl_pool' dma memory allocation failure.

Fixes: a9a9da47f8e6 ("mailbox: no need to check return value of debugfs_create functions")
Signed-off-by: Rayagonda Kokatanur 
Reviewed-by: Tyler Hicks 
Signed-off-by: Jassi Brar

mailbox: sun6i-msgbox: Add a new mailbox driver

2020-03-20T04:00:32+00:00

Allwinner sun6i, sun8i, sun9i, and sun50i SoCs contain a hardware
message box used for communication between the ARM CPUs and the ARISC
management coprocessor. This mailbox contains 8 unidirectional
4-message FIFOs.

Add a driver for it, so it can be used with the Linux mailbox framework.

Reviewed-by: Philipp Zabel 
Signed-off-by: Samuel Holland 
Signed-off-by: Jassi Brar

mailbox: bcm-pdc: Use scnprintf() for avoiding potential buffer overflow

2020-03-20T04:00:32+00:00

Since snprintf() returns the would-be-output size instead of the
actual output size, the succeeding calls may go beyond the given
buffer limit.  Fix it by replacing with scnprintf().

Signed-off-by: Takashi Iwai 
Signed-off-by: Jassi Brar