linux-kernel - [PATCH] clk: rockchip: select hdmiphy clock source for rk3228

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Date:   Wed, 12 Jun 2019 13:33:43 +0000
From:   Justin Swartz <justin.swartz@...ingedge.co.za>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     Justin Swartz <justin.swartz@...ingedge.co.za>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] clk: rockchip: select hdmiphy clock source for rk3228

Unless explictly configured by a bootloader, the hdmiphy clock parent
defaults to the xin24m clock source. This configuration does not yield
any HDMI video output, so let hdmiphy_phy (the HDMI PHY output clock)
be the parent instead.

Signed-off-by: Justin Swartz <justin.swartz@...ingedge.co.za>
---
 drivers/clk/rockchip/clk-rk3228.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/rockchip/clk-rk3228.c b/drivers/clk/rockchip/clk-rk3228.c
index 1c5267d134ee..00a195e6c014 100644
--- a/drivers/clk/rockchip/clk-rk3228.c
+++ b/drivers/clk/rockchip/clk-rk3228.c
@@ -699,6 +699,9 @@ static void __init rk3228_clk_init(struct device_node *np)
 		return;
 	}
 
+	/* Let hdmiphy_phy be the parent of the hdmiphy clock. */
+	writel_relaxed(HIWORD_UPDATE(0, 1, 13), reg_base + RK2928_MISC_CON);
+
 	ctx = rockchip_clk_init(np, reg_base, CLK_NR_CLKS);
 	if (IS_ERR(ctx)) {
 		pr_err("%s: rockchip clk init failed\n", __func__);
-- 
2.11.0