From: Martin Sperl Date: Mon, 29 Feb 2016 11:39:17 +0000 (+0000) Subject: clk: bcm2835: pll_off should only update CM_PLL_ANARST X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=6727f086cfe4ddcc651eb2bf4301abfcf619be06;p=deliverable%2Flinux.git clk: bcm2835: pll_off should only update CM_PLL_ANARST bcm2835_pll_off is currently assigning CM_PLL_ANARST to the control register, which may lose the other bits that are currently set by the clock dividers. It also now locks during the read/modify/write cycle of both registers. Fixes: 41691b8862e2 ("clk: bcm2835: Add support for programming the audio domain clocks") Signed-off-by: Martin Sperl Signed-off-by: Eric Anholt Reviewed-by: Eric Anholt --- diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c index c74ed3fd496d..adbaa55e939c 100644 --- a/drivers/clk/bcm/clk-bcm2835.c +++ b/drivers/clk/bcm/clk-bcm2835.c @@ -910,8 +910,14 @@ static void bcm2835_pll_off(struct clk_hw *hw) struct bcm2835_cprman *cprman = pll->cprman; const struct bcm2835_pll_data *data = pll->data; - cprman_write(cprman, data->cm_ctrl_reg, CM_PLL_ANARST); - cprman_write(cprman, data->a2w_ctrl_reg, A2W_PLL_CTRL_PWRDN); + spin_lock(&cprman->regs_lock); + cprman_write(cprman, data->cm_ctrl_reg, + cprman_read(cprman, data->cm_ctrl_reg) | + CM_PLL_ANARST); + cprman_write(cprman, data->a2w_ctrl_reg, + cprman_read(cprman, data->a2w_ctrl_reg) | + A2W_PLL_CTRL_PWRDN); + spin_unlock(&cprman->regs_lock); } static int bcm2835_pll_on(struct clk_hw *hw)