[PATCH 5.11 357/601] clk: zynqmp: pll: add set_pll_mode to check condition in zynqmp_pll_enable

Greg Kroah-Hartman
2021-05-12T17:39:25Z

From: Quanyang Wang <quanyang.wang@windriver.com>

[ Upstream commit 394cdb69a3c30b33524cf1204afe5cceaba69cdc ]

If there is a IOCTL_SET_PLL_FRAC_MODE request sent to ATF ever,
we shouldn't skip invoking PM_CLOCK_ENABLE fn even though this
pll has been enabled. In ATF implementation, it will only assign
the mode to the variable (struct pm_pll *)pll->mode when handling
IOCTL_SET_PLL_FRAC_MODE call. Invoking PM_CLOCK_ENABLE can force
ATF send request to PWU to set the pll mode to PLL's register.

There is a scenario that happens in enabling VPLL_INT(clk_id:96):
1) VPLL_INT has been enabled during booting.
2) A driver calls clk_set_rate and according to the rate, the VPLL_INT
should be set to FRAC mode. Then zynqmp_pll_set_mode is called
to pass IOCTL_SET_PLL_FRAC_MODE to ATF. Note that at this point
ATF just stores the mode to a variable.
3) This driver calls clk_prepare_enable and zynqmp_pll_enable is
called to try to enable VPLL_INT pll. Because of 1), the function
zynqmp_pll_enable just returns without doing anything after checking
that this pll has been enabled.

In the scenario above, the pll mode of VPLL_INT will never be set
successfully. So adding set_pll_mode to check condition to fix it.

Fixes: 3fde0e16d016 ("drivers: clk: Add ZynqMP clock driver")
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20210406153131.601701-1-quanyang.wang@windriver.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/clk/zynqmp/pll.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/zynqmp/pll.c b/drivers/clk/zynqmp/pll.c
index 03bfe62c1e62..abe6afbf3407 100644
--- a/drivers/clk/zynqmp/pll.c
+++ b/drivers/clk/zynqmp/pll.c
@@ -14,10 +14,12 @@
* struct zynqmp_pll - PLL clock
* @hw: Handle between common and hardware-specific interfaces
* @clk_id: PLL clock ID
+ * @set_pll_mode: Whether an IOCTL_SET_PLL_FRAC_MODE request be sent to ATF
*/
struct zynqmp_pll {
struct clk_hw hw;
u32 clk_id;
+ bool set_pll_mode;
};

#define to_zynqmp_pll(_hw) container_of(_hw, struct zynqmp_pll, hw)
@@ -81,6 +83,8 @@ static inline void zynqmp_pll_set_mode(struct clk_hw *hw, bool on)
if (ret)
pr_warn_once("%s() PLL set frac mode failed for %s, ret = %d\n",
__func__, clk_name, ret);
+ else
+ clk->set_pll_mode = true;
}

/**
@@ -240,9 +244,15 @@ static int zynqmp_pll_enable(struct clk_hw *hw)
u32 clk_id = clk->clk_id;
int ret;

- if (zynqmp_pll_is_enabled(hw))
+ /*
+ * Don't skip enabling clock if there is an IOCTL_SET_PLL_FRAC_MODE request
+ * that has been sent to ATF.
+ */
+ if (zynqmp_pll_is_enabled(hw) && (!clk->set_pll_mode))
return 0;

+ clk->set_pll_mode = false;
+
ret = zynqmp_pm_clock_enable(clk_id);
if (ret)
pr_warn_once("%s() clock enable failed for %s, ret = %d\n",
--
2.30.2