diff options
| author | Eric Anholt <eric@anholt.net> | 2016-09-30 20:07:27 +0300 |
|---|---|---|
| committer | Stephen Boyd <sboyd@codeaurora.org> | 2016-10-18 01:34:36 +0300 |
| commit | c4e634ce412d97f0e61223b2a5b3f8f9600cd4dc (patch) | |
| tree | 6a6496905df153f26dae703b28b82d907885bee5 /drivers/clk/bcm/clk-bcm2835.c | |
| parent | 1c7032258d568f9a7aeb4c541786699d9a219a2a (diff) | |
| download | linux-c4e634ce412d97f0e61223b2a5b3f8f9600cd4dc.tar.xz | |
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>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Diffstat (limited to 'drivers/clk/bcm/clk-bcm2835.c')
| -rw-r--r-- | drivers/clk/bcm/clk-bcm2835.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c index b68bf573dcfb..8c7763fd9efc 100644 --- a/drivers/clk/bcm/clk-bcm2835.c +++ b/drivers/clk/bcm/clk-bcm2835.c @@ -502,8 +502,12 @@ static long bcm2835_pll_rate_from_divisors(unsigned long parent_rate, 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); @@ -608,13 +612,6 @@ static int bcm2835_pll_set_rate(struct clk_hw *hw, 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; |