brcm2708: update linux 4.4 patches to latest version

As usual these patches were extracted from the raspberry pi repo:
https://github.com/raspberrypi/linux/tree/rpi-4.4.y

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.4/0257-clk-bcm2835-add-locking-to-pll-_on-off-methods.patch b/target/linux/brcm2708/patches-4.4/0257-clk-bcm2835-add-locking-to-pll-_on-off-methods.patch
new file mode 100644
index 0000000..29f4552
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0257-clk-bcm2835-add-locking-to-pll-_on-off-methods.patch
@@ -0,0 +1,53 @@
+From 39c3c0d0a8d038a692b95cc13e7d6acf2d04cf14 Mon Sep 17 00:00:00 2001
+From: Martin Sperl <kernel@martin.sperl.org>
+Date: Mon, 29 Feb 2016 11:39:18 +0000
+Subject: [PATCH 257/304] 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>
+(cherry picked from commit ec36a5c6682fdd5328abf15c3c67281bed0241d7)
+---
+ 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
+@@ -1097,10 +1097,12 @@ static void bcm2835_pll_divider_off(stru
+ 	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)
+@@ -1109,12 +1111,14 @@ static int bcm2835_pll_divider_on(struct
+ 	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;
+ }