From 325b7b90f9a87a4bdee7059d10bd98a11154ceae Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Sun, 9 Jul 2017 15:28:09 +0200 Subject: [PATCH] clk: vc5: Do not warn about disabled output buffer input muxes The output buffer input mux can be configured in either of three states -- disabled, input from FOD, input from previous output. If the output buffer input mux is set to disabled, the code in vc5_clk_out_get_parent() would consider this an invalid setting and warn about it, which is not necessarily the case. In case the output buffer input mux is disabled, default to input from FOD to have some parent and don't print the warning. Signed-off-by: Marek Vasut Cc: Stephen Boyd Cc: Alexey Firago Cc: Michael Turquette Cc: Laurent Pinchart Cc: linux-renesas-soc@vger.kernel.org Tested-by: Laurent Pinchart # Salvator-XS with the display LVDS output. Signed-off-by: Stephen Boyd --- drivers/clk/clk-versaclock5.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/clk/clk-versaclock5.c b/drivers/clk/clk-versaclock5.c index b70c2e684de6..185d7a5d36e0 100644 --- a/drivers/clk/clk-versaclock5.c +++ b/drivers/clk/clk-versaclock5.c @@ -541,6 +541,9 @@ static unsigned char vc5_clk_out_get_parent(struct clk_hw *hw) regmap_read(vc5->regmap, VC5_OUT_DIV_CONTROL(hwdata->num), &src); src &= mask; + if (src == 0) /* Input mux set to DISABLED */ + return 0; + if ((src & fodclkmask) == VC5_OUT_DIV_CONTROL_EN_FOD) return 0; -- 2.20.1