clk: update clk_clean_rate_cache to use private clk struct

In clk_clean_rate_cache, clk->rate should update the private clock
struct, in particular when CCF is activated, to save the cached
rate value.

When clk_get_parent_rate is called, the cached information
is read from pclk->rate, with pclk = clk_get_parent(clk).

As the cached is read from private clk data, the update should
be done also on it.

Fixes: 6b7fd3128f7 ("clk: fix set_rate to clean up cached rates for the hierarchy")
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Link: https://lore.kernel.org/r/20220620153717.v2.1.Ifa06360115ffa3f3307372e6cdd98ec16759d6ba@changeid
Link: https://lore.kernel.org/r/20220712142352.RESEND.v2.1.Ifa06360115ffa3f3307372e6cdd98ec16759d6ba@changeid/

diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c
index 4678ed4..2f96355 100644 (file)
--- a/drivers/clk/clk-uclass.c
+++ b/drivers/clk/clk-uclass.c
@@ -544,6 +544,19 @@ ulong clk_round_rate(struct clk *clk, ulong rate)
        return ops->round_rate(clk, rate);
 }
 
+static void clk_get_priv(struct clk *clk, struct clk **clkp)
+{
+       *clkp = clk;
+
+       /* get private clock struct associated to the provided clock */
+       if (CONFIG_IS_ENABLED(CLK_CCF)) {
+               /* Take id 0 as a non-valid clk, such as dummy */
+               if (clk->id)
+                       clk_get_by_id(clk->id, clkp);
+       }
+}
+
+/* clean cache, called with private clock struct */
 static void clk_clean_rate_cache(struct clk *clk)
 {
        struct udevice *child_dev;
@@ -563,6 +576,7 @@ static void clk_clean_rate_cache(struct clk *clk)
 ulong clk_set_rate(struct clk *clk, ulong rate)
 {
        const struct clk_ops *ops;
+       struct clk *clkp;
 
        debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
        if (!clk_valid(clk))
@@ -572,8 +586,10 @@ ulong clk_set_rate(struct clk *clk, ulong rate)
        if (!ops->set_rate)
                return -ENOSYS;
 
+       /* get private clock struct used for cache */
+       clk_get_priv(clk, &clkp);
        /* Clean up cached rates for us and all child clocks */
-       clk_clean_rate_cache(clk);
+       clk_clean_rate_cache(clkp);
 
        return ops->set_rate(clk, rate);
 }