diff options
| author | Boris Brezillon <boris.brezillon@bootlin.com> | 2018-03-22 10:11:30 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-24 09:34:14 +0200 |
| commit | 6af2423153c430055c39947550ca341d75d0120f (patch) | |
| tree | 084c2646dfee4853acb2675f63b50db09a568acb | |
| parent | 5971ee251010e1ce4969cded71800ce993a36a33 (diff) | |
clk: bcm2835: De-assert/assert PLL reset signal when appropriate
commit 753872373b599384ac7df809aa61ea12d1c4d5d1 upstream.
In order to enable a PLL, not only the PLL has to be powered up and
locked, but you also have to de-assert the reset signal. The last part
was missing. Add it so PLLs that were not enabled by the FW/bootloader
can be enabled from Linux.
Fixes: 41691b8862e2 ("clk: bcm2835: Add support for programming the audio domain clocks")
Cc: <stable@vger.kernel.org>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/clk/bcm/clk-bcm2835.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c index abdc149941e2..73aab6e984cd 100644 --- a/drivers/clk/bcm/clk-bcm2835.c +++ b/drivers/clk/bcm/clk-bcm2835.c @@ -545,9 +545,7 @@ static void bcm2835_pll_off(struct clk_hw *hw) const struct bcm2835_pll_data *data = pll->data; 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->cm_ctrl_reg, CM_PLL_ANARST); cprman_write(cprman, data->a2w_ctrl_reg, cprman_read(cprman, data->a2w_ctrl_reg) | A2W_PLL_CTRL_PWRDN); @@ -583,6 +581,10 @@ static int bcm2835_pll_on(struct clk_hw *hw) cpu_relax(); } + cprman_write(cprman, data->a2w_ctrl_reg, + cprman_read(cprman, data->a2w_ctrl_reg) | + A2W_PLL_CTRL_PRST_DISABLE); + return 0; } |