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Subject[PATCH v2 5/6] clk: rockchip: add pll up and down when change pll freq
Date
set pll sequence:
->set pll to slow mode or other plls
->set pll down
->set pll params
->set pll up
->wait pll lock status
->set pll to normal mode

To slove the system error:
wait_pll_lock: timeout waiting for pll to lock
pll_set_params: pll update unsucessful,
trying to restore old params

Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
---
drivers/clk/rockchip/clk-pll.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/clk/rockchip/clk-pll.c b/drivers/clk/rockchip/clk-pll.c
index dd0433d4753e..45a64526c78c 100644
--- a/drivers/clk/rockchip/clk-pll.c
+++ b/drivers/clk/rockchip/clk-pll.c
@@ -208,6 +208,11 @@ static int rockchip_rk3036_pll_set_params(struct rockchip_clk_pll *pll,
rate_change_remuxed = 1;
}

+ /* set pll power down */
+ writel(HIWORD_UPDATE(RK3036_PLLCON1_PWRDOWN,
+ RK3036_PLLCON1_PWRDOWN, 0),
+ pll->reg_base + RK3036_PLLCON(1));
+
/* update pll values */
writel_relaxed(HIWORD_UPDATE(rate->fbdiv, RK3036_PLLCON0_FBDIV_MASK,
RK3036_PLLCON0_FBDIV_SHIFT) |
@@ -229,6 +234,11 @@ static int rockchip_rk3036_pll_set_params(struct rockchip_clk_pll *pll,
pllcon |= rate->frac << RK3036_PLLCON2_FRAC_SHIFT;
writel_relaxed(pllcon, pll->reg_base + RK3036_PLLCON(2));

+ /* set pll power up */
+ writel(HIWORD_UPDATE(0, RK3036_PLLCON1_PWRDOWN, 0),
+ pll->reg_base + RK3036_PLLCON(1));
+ udelay(1);
+
/* wait for the pll to lock */
ret = rockchip_pll_wait_lock(pll);
if (ret) {
@@ -685,6 +695,11 @@ static int rockchip_rk3399_pll_set_params(struct rockchip_clk_pll *pll,
rate_change_remuxed = 1;
}

+ /* set pll power down */
+ writel(HIWORD_UPDATE(RK3399_PLLCON3_PWRDOWN,
+ RK3399_PLLCON3_PWRDOWN, 0),
+ pll->reg_base + RK3399_PLLCON(3));
+
/* update pll values */
writel_relaxed(HIWORD_UPDATE(rate->fbdiv, RK3399_PLLCON0_FBDIV_MASK,
RK3399_PLLCON0_FBDIV_SHIFT),
@@ -708,6 +723,12 @@ static int rockchip_rk3399_pll_set_params(struct rockchip_clk_pll *pll,
RK3399_PLLCON3_DSMPD_SHIFT),
pll->reg_base + RK3399_PLLCON(3));

+ /* set pll power up */
+ writel(HIWORD_UPDATE(0,
+ RK3399_PLLCON3_PWRDOWN, 0),
+ pll->reg_base + RK3399_PLLCON(3));
+ udelay(1);
+
/* wait for the pll to lock */
ret = rockchip_rk3399_pll_wait_lock(pll);
if (ret) {
--
1.9.1


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