This is a note to let you know that I've just added the patch titled
clk: bcm2835: Fix PLL poweron
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
clk-bcm2835-fix-pll-poweron.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e708b383f4b94feca2e0d5d06e1cfc13cdfea100 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@xxxxxxxxxx>
Date: Wed, 13 Apr 2016 13:05:03 -0700
Subject: clk: bcm2835: Fix PLL poweron
From: Eric Anholt <eric@xxxxxxxxxx>
commit e708b383f4b94feca2e0d5d06e1cfc13cdfea100 upstream.
In poweroff, we set the reset bit and the power down bit, but only
managed to unset the reset bit for poweron. This meant that if HDMI
did -EPROBE_DEFER after it had grabbed its clocks, we'd power down the
PLLH (that had been on at boot time) and never recover.
Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
Fixes: 41691b8862e2 ("clk: bcm2835: Add support for programming the audio domain clocks")
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/clk/bcm/clk-bcm2835.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/clk/bcm/clk-bcm2835.c
+++ b/drivers/clk/bcm/clk-bcm2835.c
@@ -901,6 +901,10 @@ static int bcm2835_pll_on(struct clk_hw
const struct bcm2835_pll_data *data = pll->data;
ktime_t timeout;
+ cprman_write(cprman, data->a2w_ctrl_reg,
+ cprman_read(cprman, data->a2w_ctrl_reg) &
+ ~A2W_PLL_CTRL_PWRDN);
+
/* Take the PLL out of reset. */
cprman_write(cprman, data->cm_ctrl_reg,
cprman_read(cprman, data->cm_ctrl_reg) & ~CM_PLL_ANARST);
Patches currently in stable-queue which might be from eric@xxxxxxxxxx are
queue-4.4/clk-bcm2835-pll_off-should-only-update-cm_pll_anarst.patch
queue-4.4/clk-bcm2835-fix-pll-poweron.patch
queue-4.4/clk-bcm2835-divider-value-has-to-be-1-or-more.patch
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