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path: root/target/linux/brcm2708/patches-4.4/0521-clk-bcm2835-Clamp-the-PLL-s-requested-rate-to-the-ha.patch
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Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0521-clk-bcm2835-Clamp-the-PLL-s-requested-rate-to-the-ha.patch')
-rw-r--r--target/linux/brcm2708/patches-4.4/0521-clk-bcm2835-Clamp-the-PLL-s-requested-rate-to-the-ha.patch43
1 files changed, 43 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0521-clk-bcm2835-Clamp-the-PLL-s-requested-rate-to-the-ha.patch b/target/linux/brcm2708/patches-4.4/0521-clk-bcm2835-Clamp-the-PLL-s-requested-rate-to-the-ha.patch
new file mode 100644
index 0000000000..7017152d7d
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0521-clk-bcm2835-Clamp-the-PLL-s-requested-rate-to-the-ha.patch
@@ -0,0 +1,43 @@
+From 4d372013a839ae71582004fbc1aa1905c73d1497 Mon Sep 17 00:00:00 2001
+From: Eric Anholt <eric@anholt.net>
+Date: Wed, 28 Sep 2016 17:58:52 -0700
+Subject: [PATCH] clk: bcm2835: Clamp the PLL's requested rate to the hardware
+ limits.
+
+Fixes setting low-resolution video modes on HDMI. Now the PLLH_PIX
+divider adjusts itself until the PLLH is within bounds.
+
+Signed-off-by: Eric Anholt <eric@anholt.net>
+---
+ drivers/clk/bcm/clk-bcm2835.c | 11 ++++-------
+ 1 file changed, 4 insertions(+), 7 deletions(-)
+
+--- a/drivers/clk/bcm/clk-bcm2835.c
++++ b/drivers/clk/bcm/clk-bcm2835.c
+@@ -523,8 +523,12 @@ static long bcm2835_pll_rate_from_diviso
+ static long bcm2835_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+ {
++ struct bcm2835_pll *pll = container_of(hw, struct bcm2835_pll, hw);
++ const struct bcm2835_pll_data *data = pll->data;
+ u32 ndiv, fdiv;
+
++ rate = clamp(rate, data->min_rate, data->max_rate);
++
+ bcm2835_pll_choose_ndiv_and_fdiv(rate, *parent_rate, &ndiv, &fdiv);
+
+ return bcm2835_pll_rate_from_divisors(*parent_rate, ndiv, fdiv, 1);
+@@ -629,13 +633,6 @@ static int bcm2835_pll_set_rate(struct c
+ u32 ana[4];
+ int i;
+
+- if (rate < data->min_rate || rate > data->max_rate) {
+- dev_err(cprman->dev, "%s: rate out of spec: %lu vs (%lu, %lu)\n",
+- clk_hw_get_name(hw), rate,
+- data->min_rate, data->max_rate);
+- return -EINVAL;
+- }
+-
+ if (rate > data->max_fb_rate) {
+ use_fb_prediv = true;
+ rate /= 2;