diff options
| -rw-r--r-- | drivers/clk/sunxi/clk-sunxi.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c index 34ee69f4d50c..83d3eace3ebc 100644 --- a/drivers/clk/sunxi/clk-sunxi.c +++ b/drivers/clk/sunxi/clk-sunxi.c @@ -617,6 +617,31 @@ static void __init of_sunxi_table_clock_setup(const struct of_device_id *clk_mat } } +/** + * System clock protection + * + * By enabling these critical clocks, we prevent their accidental gating + * by the framework + */ +static void __init sunxi_clock_protect(void) +{ + struct clk *clk; + + /* memory bus clock - sun5i+ */ + clk = clk_get(NULL, "mbus"); + if (!IS_ERR(clk)) { + clk_prepare_enable(clk); + clk_put(clk); + } + + /* DDR clock - sun4i+ */ + clk = clk_get(NULL, "pll5_ddr"); + if (!IS_ERR(clk)) { + clk_prepare_enable(clk); + clk_put(clk); + } +} + void __init sunxi_init_clocks(void) { /* Register all the simple and basic clocks on DT */ @@ -633,4 +658,7 @@ void __init sunxi_init_clocks(void) /* Register gate clocks */ of_sunxi_table_clock_setup(clk_gates_match, sunxi_gates_clk_setup); + + /* Enable core system clocks */ + sunxi_clock_protect(); } |