[PATCH] clk: ux500: Initialize DSI clocks before registering

From: Linus Walleij <linus.walleij@linaro.org>
To: Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>
Cc: linux-clk@vger.kernel.org,
	Linus Walleij <linus.walleij@linaro.org>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Stephan Gerhold <stephan@gerhold.net>
Subject: [PATCH] clk: ux500: Initialize DSI clocks before registering
Date: Sun, 22 Dec 2019 21:29:28 +0100	[thread overview]
Message-ID: <20191222202928.14142-1-linus.walleij@linaro.org> (raw)

The DSI clocks need to be initialized properly and cannot
rely on boot defaults, this is especially important for the
U8420 SYSCLK variant of the PRCMU firmware which requires
that you poke these registers right before trying to use
the HS DSI clock. Some vital setup such as the PRCM_TVCLK_MGT
register will not happen unless we call this making some
displays fail to work on the U8420.

Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/clk/ux500/u8500_of_clk.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/ux500/u8500_of_clk.c b/drivers/clk/ux500/u8500_of_clk.c
index 0aedd42fad52..c1043a6b383f 100644
--- a/drivers/clk/ux500/u8500_of_clk.c
+++ b/drivers/clk/ux500/u8500_of_clk.c
@@ -65,6 +65,9 @@ static void u8500_clk_init(struct device_node *np)
 	u32 bases[CLKRST_MAX];
 	int i;
 
+	/* Initialize display clocks */
+	prcmu_set_display_clocks();
+
 	for (i = 0; i < ARRAY_SIZE(bases); i++) {
 		struct resource r;
 
-- 
2.21.0

