This is a note to let you know that I've just added the patch titled
bus: mhi: pci_generic: No-Op for device_wake operations
to the 5.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bus-mhi-pci_generic-no-op-for-device_wake-operations.patch
and it can be found in the queue-5.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 8c020faa49d8a20345532c0e8f3c10d98381a295
Author: Loic Poulain <loic.poulain@xxxxxxxxxx>
Date: Fri Mar 5 20:16:46 2021 +0100
bus: mhi: pci_generic: No-Op for device_wake operations
[ Upstream commit e3e5e6508fc1c0e98a5a264853713dd30a60e5e5 ]
The wake_db register presence is highly speculative and can fuze MHI
devices. Indeed, currently the wake_db register address is defined at
entry 127 of the 'Channel doorbell array', thus writing to this address
is equivalent to ringing the doorbell for channel 127, causing trouble
with some devics (e.g. SDX24 based modems) that get an unexpected
channel 127 doorbell interrupt.
This change fixes that issue by setting wake get/put as no-op for
pci_generic devices. The wake device sideband mechanism seems really
specific to each device, and is AFAIK not defined by the MHI spec.
It also removes zeroing initialization of wake_db register during MMIO
initialization, the register being set via wake_get/put accessors few
cycles later during M0 transition.
Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Link: https://lore.kernel.org/r/1614971808-22156-4-git-send-email-loic.poulain@xxxxxxxxxx
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index 419d026197ad..6cb0d67fc921 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -508,8 +508,6 @@ int mhi_init_mmio(struct mhi_controller *mhi_cntrl)
/* Setup wake db */
mhi_cntrl->wake_db = base + val + (8 * MHI_DEV_WAKE_DB);
- mhi_write_reg(mhi_cntrl, mhi_cntrl->wake_db, 4, 0);
- mhi_write_reg(mhi_cntrl, mhi_cntrl->wake_db, 0, 0);
mhi_cntrl->wake_set = false;
/* Setup channel db address for each channel in tre_ring */
diff --git a/drivers/bus/mhi/pci_generic.c b/drivers/bus/mhi/pci_generic.c
index 20673a4b4a3c..356c19ce4bbf 100644
--- a/drivers/bus/mhi/pci_generic.c
+++ b/drivers/bus/mhi/pci_generic.c
@@ -230,6 +230,21 @@ static void mhi_pci_status_cb(struct mhi_controller *mhi_cntrl,
}
}
+static void mhi_pci_wake_get_nop(struct mhi_controller *mhi_cntrl, bool force)
+{
+ /* no-op */
+}
+
+static void mhi_pci_wake_put_nop(struct mhi_controller *mhi_cntrl, bool override)
+{
+ /* no-op */
+}
+
+static void mhi_pci_wake_toggle_nop(struct mhi_controller *mhi_cntrl)
+{
+ /* no-op */
+}
+
static bool mhi_pci_is_alive(struct mhi_controller *mhi_cntrl)
{
struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev);
@@ -433,6 +448,9 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
mhi_cntrl->status_cb = mhi_pci_status_cb;
mhi_cntrl->runtime_get = mhi_pci_runtime_get;
mhi_cntrl->runtime_put = mhi_pci_runtime_put;
+ mhi_cntrl->wake_get = mhi_pci_wake_get_nop;
+ mhi_cntrl->wake_put = mhi_pci_wake_put_nop;
+ mhi_cntrl->wake_toggle = mhi_pci_wake_toggle_nop;
err = mhi_pci_claim(mhi_cntrl, info->bar_num, DMA_BIT_MASK(info->dma_data_width));
if (err)
