From 79c4c3db7d86b9bec94562275efc82e58f3d0132 Mon Sep 17 00:00:00 2001
From: Dave Jiang <dave.jiang@intel.com>
Date: Tue, 12 Oct 2021 11:01:59 -0700
Subject: [PATCH] dmaengine: idxd: check GENCAP config support for gencfg register
Git-commit: 79c4c3db7d86b9bec94562275efc82e58f3d0132
Patch-mainline: v5.16-rc1
References: git-fixes
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@intel.com>
Link: https://lore.kernel.org/r/163406171896.1303830.11217958011385656998.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/dma/idxd/device.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index cbbfa17d8d11..27612329f510 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -791,7 +791,7 @@ 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);
--
2.31.1