clk: rockchip: rk3399: allow clk_cifout to force clk_cifout_src to reparent

commit 933bf364e152cd60902cf9585c2ba310d593e69f upstream.

clk_cifout is derived from clk_cifout_src through an integer divider
limited to 32. clk_cifout_src is a child of either cpll, gpll or npll
without any possibility of a divider of any sort. The default clock
parent is cpll.

Let's allow clk_cifout to ask its parent clk_cifout_src to reparent in
order to find the real closest possible rate for clk_cifout and not one
derived from cpll only.

Cc: stable@vger.kernel.org # 4.10+
Fixes: e59ad083320f ("clk: rockchip: fix the rk3399 cifout clock")
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Link: https://lore.kernel.org/r/20221117-rk3399-cifout-set-rate-parent-v1-0-432548d04081@theobroma-systems.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/clk/rockchip/clk-rk3399.c b/drivers/clk/rockchip/clk-rk3399.c
index ce1d2446f142fac715549ad589037f008450d47f..1a75cc9f68efd4e9922f59f6b0dec73ac8ec6872 100644 (file)
--- a/drivers/clk/rockchip/clk-rk3399.c
+++ b/drivers/clk/rockchip/clk-rk3399.c
@@ -1259,7 +1259,7 @@ static struct rockchip_clk_branch rk3399_clk_branches[] __initdata = {
                        RK3399_CLKSEL_CON(56), 6, 2, MFLAGS,
                        RK3399_CLKGATE_CON(10), 7, GFLAGS),
 
-       COMPOSITE_NOGATE(SCLK_CIF_OUT, "clk_cifout", mux_clk_cif_p, 0,
+       COMPOSITE_NOGATE(SCLK_CIF_OUT, "clk_cifout", mux_clk_cif_p, CLK_SET_RATE_PARENT,
                         RK3399_CLKSEL_CON(56), 5, 1, MFLAGS, 0, 5, DFLAGS),
 
        /* gic */