This is a note to let you know that I've just added the patch titled
dmaengine: idxd: check GENCAP config support for gencfg register
to the 5.15-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:
dmaengine-idxd-check-gencap-config-support-for-gencf.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit fe31ce502b6ca320edbd6d7ff1982667c3552f41
Author: Dave Jiang <dave.jiang@xxxxxxxxx>
Date: Tue Oct 12 11:01:59 2021 -0700
dmaengine: idxd: check GENCAP config support for gencfg register
[ Upstream commit 79c4c3db7d86b9bec94562275efc82e58f3d0132 ]
DSA spec 1.2 has moved the GENCFG register under the GENCAP configuration
support with respect to writability. Add check in driver before writing to
GENCFG register.
Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Link: https://lore.kernel.org/r/163406171896.1303830.11217958011385656998.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index b468ca36d3a0..3cda1c5faf3c 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -801,7 +801,7 @@ static int idxd_groups_config_write(struct idxd_device *idxd)
struct device *dev = &idxd->pdev->dev;
/* Setup bandwidth token limit */
- if (idxd->token_limit) {
+ if (idxd->hw.gen_cap.config_en && idxd->token_limit) {
reg.bits = ioread32(idxd->reg_base + IDXD_GENCFG_OFFSET);
reg.token_limit = idxd->token_limit;
iowrite32(reg.bits, idxd->reg_base + IDXD_GENCFG_OFFSET);
