clk: meson: check pll rate param table before using it

Make sure the rate param table is available before using it.
Some read-only plls don't provide it, which is ok since the
table is not used by read-only clocks. R/W clocks are supposed
to provide it, but it does not hurt check it.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>

diff --git a/drivers/clk/meson/clk-pll.c b/drivers/clk/meson/clk-pll.c
index 0134155..2614341 100644 (file)
--- a/drivers/clk/meson/clk-pll.c
+++ b/drivers/clk/meson/clk-pll.c
@@ -94,6 +94,13 @@ static long meson_clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
        const struct pll_rate_table *rate_table = pll->rate_table;
        int i;
 
+       /*
+        * if the table is missing, just return the current rate
+        * since we don't have the other available frequencies
+        */
+       if (!rate_table)
+               return meson_clk_pll_recalc_rate(hw, *parent_rate);
+
        for (i = 0; i < pll->rate_count; i++) {
                if (rate <= rate_table[i].rate)
                        return rate_table[i].rate;
@@ -109,6 +116,9 @@ static const struct pll_rate_table *meson_clk_get_pll_settings(struct meson_clk_
        const struct pll_rate_table *rate_table = pll->rate_table;
        int i;
 
+       if (!rate_table)
+               return NULL;
+
        for (i = 0; i < pll->rate_count; i++) {
                if (rate == rate_table[i].rate)
                        return &rate_table[i];