[PATCH v5 8/9] clk: cs2000-cp: freeze config during register fiddling

Daniel Mack
2021-09-01T09:36:43Z

Make sure to freeze the configuration of the chip during the programming
of 32-bit registers. This avoids the processing of invalid intermediate
states.

Signed-off-by: Daniel Mack <daniel@zonque.org>
---
drivers/clk/clk-cs2000-cp.c | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/drivers/clk/clk-cs2000-cp.c b/drivers/clk/clk-cs2000-cp.c
index 9f99e39b41f2..1baf0595ba59 100644
--- a/drivers/clk/clk-cs2000-cp.c
+++ b/drivers/clk/clk-cs2000-cp.c
@@ -52,6 +52,7 @@
#define FRACNSRC_DYNAMIC (1 << 0)

/* GLOBAL_CFG */
+#define FREEZE (1 << 7)
#define ENDEV2 (0x1)

/* FUNC_CFG1 */
@@ -335,6 +336,10 @@ static int __cs2000_set_rate(struct cs2000_priv *priv, int ch,
{
int ret;

+ ret = cs2000_bset(priv, GLOBAL_CFG, FREEZE, FREEZE);
+ if (ret < 0)
+ return ret;
+
ret = cs2000_select_ratio_mode(priv, rate, parent_rate);
if (ret < 0)
return ret;
@@ -347,6 +352,10 @@ static int __cs2000_set_rate(struct cs2000_priv *priv, int ch,
if (ret < 0)
return ret;

+ ret = cs2000_bset(priv, GLOBAL_CFG, FREEZE, 0);
+ if (ret < 0)
+ return ret;
+
priv->saved_rate = rate;
priv->saved_parent_rate = parent_rate;

--
2.31.1