This is a note to let you know that I've just added the patch titled
clk: imx: composite-7ulp: Check the PCC present bit
to the 6.6-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:
clk-imx-composite-7ulp-check-the-pcc-present-bit.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 8e31b73597a5cc7069ea9a570969a61e74dbed38
Author: Ye Li <ye.li@xxxxxxx>
Date: Fri Jun 7 21:33:35 2024 +0800
clk: imx: composite-7ulp: Check the PCC present bit
[ Upstream commit 4717ccadb51e2630790dddd222830702de17f090 ]
When some module is disabled by fuse, its PCC PR bit is default 0 and
PCC is not operational. Any write to this PCC will cause SError.
Fixes: b40ba8065347 ("clk: imx: Update the compsite driver to support imx8ulp")
Reviewed-by: Peng Fan <peng.fan@xxxxxxx>
Signed-off-by: Ye Li <ye.li@xxxxxxx>
Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
Reviewed-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240607133347.3291040-4-peng.fan@xxxxxxxxxxx
Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/clk/imx/clk-composite-7ulp.c b/drivers/clk/imx/clk-composite-7ulp.c
index e208ddc511339..db7f40b07d1ab 100644
--- a/drivers/clk/imx/clk-composite-7ulp.c
+++ b/drivers/clk/imx/clk-composite-7ulp.c
@@ -14,6 +14,7 @@
#include "../clk-fractional-divider.h"
#include "clk.h"
+#define PCG_PR_MASK BIT(31)
#define PCG_PCS_SHIFT 24
#define PCG_PCS_MASK 0x7
#define PCG_CGC_SHIFT 30
@@ -78,6 +79,12 @@ static struct clk_hw *imx_ulp_clk_hw_composite(const char *name,
struct clk_hw *hw;
u32 val;
+ val = readl(reg);
+ if (!(val & PCG_PR_MASK)) {
+ pr_info("PCC PR is 0 for clk:%s, bypass\n", name);
+ return 0;
+ }
+
if (mux_present) {
mux = kzalloc(sizeof(*mux), GFP_KERNEL);
if (!mux)
