From: Ye Li Date: Fri, 7 Jun 2024 13:33:35 +0000 (+0800) Subject: clk: imx: composite-7ulp: Check the PCC present bit X-Git-Tag: v6.12-rc1~83^2~2^4^2^2~14 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4717ccadb51e2630790dddd222830702de17f090;p=thirdparty%2Fkernel%2Flinux.git clk: imx: composite-7ulp: Check the PCC present bit 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 Signed-off-by: Ye Li Signed-off-by: Peng Fan Reviewed-by: Abel Vesa Link: https://lore.kernel.org/r/20240607133347.3291040-4-peng.fan@oss.nxp.com Signed-off-by: Abel Vesa --- 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)