4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Boris Brezillon boris.brezillon@bootlin.com
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
--- drivers/clk/bcm/clk-bcm2835.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/clk/bcm/clk-bcm2835.c +++ b/drivers/clk/bcm/clk-bcm2835.c @@ -891,9 +891,7 @@ static void bcm2835_pll_off(struct clk_h 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); @@ -929,6 +927,10 @@ static int bcm2835_pll_on(struct clk_hw cpu_relax(); }
+ cprman_write(cprman, data->a2w_ctrl_reg, + cprman_read(cprman, data->a2w_ctrl_reg) | + A2W_PLL_CTRL_PRST_DISABLE); + return 0; }