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
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>
---
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 cbbfa17d8d11b..27612329f5107 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);