diff options
| author | Martin Sperl <kernel@martin.sperl.org> | 2016-02-29 14:39:18 +0300 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2016-03-17 20:42:17 +0300 |
| commit | ec36a5c6682fdd5328abf15c3c67281bed0241d7 (patch) | |
| tree | 661c3386d950521ff390a5415eb86636b1d7ec31 /drivers/clk/bcm/clk-bcm2835.c | |
| parent | 6727f086cfe4ddcc651eb2bf4301abfcf619be06 (diff) | |
| download | linux-ec36a5c6682fdd5328abf15c3c67281bed0241d7.tar.xz | |
clk: bcm2835: add locking to pll*_on/off methods
Add missing locking to:
* bcm2835_pll_divider_on
* bcm2835_pll_divider_off
to protect the read modify write cycle for the
register access protecting both cm_reg and a2w_reg
registers.
Fixes: 41691b8862e2 ("clk: bcm2835: Add support for programming the
audio domain clocks")
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/clk/bcm/clk-bcm2835.c')
| -rw-r--r-- | drivers/clk/bcm/clk-bcm2835.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c index adbaa55e939c..a39f8a7b6410 100644 --- a/drivers/clk/bcm/clk-bcm2835.c +++ b/drivers/clk/bcm/clk-bcm2835.c @@ -1085,10 +1085,12 @@ static void bcm2835_pll_divider_off(struct clk_hw *hw) struct bcm2835_cprman *cprman = divider->cprman; const struct bcm2835_pll_divider_data *data = divider->data; + spin_lock(&cprman->regs_lock); cprman_write(cprman, data->cm_reg, (cprman_read(cprman, data->cm_reg) & ~data->load_mask) | data->hold_mask); cprman_write(cprman, data->a2w_reg, A2W_PLL_CHANNEL_DISABLE); + spin_unlock(&cprman->regs_lock); } static int bcm2835_pll_divider_on(struct clk_hw *hw) @@ -1097,12 +1099,14 @@ static int bcm2835_pll_divider_on(struct clk_hw *hw) struct bcm2835_cprman *cprman = divider->cprman; const struct bcm2835_pll_divider_data *data = divider->data; + spin_lock(&cprman->regs_lock); cprman_write(cprman, data->a2w_reg, cprman_read(cprman, data->a2w_reg) & ~A2W_PLL_CHANNEL_DISABLE); cprman_write(cprman, data->cm_reg, cprman_read(cprman, data->cm_reg) & ~data->hold_mask); + spin_unlock(&cprman->regs_lock); return 0; } |