linux-kernel - [PATCH 4/5] clk: meson: meson8b: add the HDMI PLL M/N parameters

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Date:   Mon,  4 Jan 2021 14:28:05 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     jbrunet@...libre.com, linux-amlogic@...ts.infradead.org
Cc:     mturquette@...libre.com, sboyd@...nel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH 4/5] clk: meson: meson8b: add the HDMI PLL M/N parameters

The 3.10 vendor kernel uses only specific HDMI PLL M/N parameter
combinations. The PLL won't lock for values smaller than 50 if the
internal doubling (which is yet unknown how to use it) is disabled.
However, when this doubling is enabled then the values smaller than 50
will lock just fine. The only restriction for values greater than 50 is
that the resulting frequency must not exceed the 3.0GHz limit.

These values are taken from the endlessm 3.10 kernel which includes some
additional M/N combinations for some VESA and 75Hz display modes.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/clk/meson/meson8b.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
index 1ae771bac4a5..8061c11389a9 100644
--- a/drivers/clk/meson/meson8b.c
+++ b/drivers/clk/meson/meson8b.c
@@ -118,6 +118,28 @@ static struct clk_regmap meson8b_fixed_pll = {
 	},
 };
 
+static const struct pll_params_table hdmi_pll_params_table[] = {
+	PLL_PARAMS(34, 1),
+	PLL_PARAMS(40, 1),
+	PLL_PARAMS(42, 1),
+	PLL_PARAMS(44, 1),
+	PLL_PARAMS(45, 1),
+	PLL_PARAMS(49, 1),
+	PLL_PARAMS(52, 1),
+	PLL_PARAMS(54, 1),
+	PLL_PARAMS(56, 1),
+	PLL_PARAMS(59, 1),
+	PLL_PARAMS(60, 1),
+	PLL_PARAMS(61, 1),
+	PLL_PARAMS(62, 1),
+	PLL_PARAMS(64, 1),
+	PLL_PARAMS(66, 1),
+	PLL_PARAMS(68, 1),
+	PLL_PARAMS(71, 1),
+	PLL_PARAMS(82, 1),
+	{ /* sentinel */ }
+};
+
 static struct clk_regmap meson8b_hdmi_pll_dco = {
 	.data = &(struct meson_clk_pll_data){
 		.en = {
@@ -150,6 +172,7 @@ static struct clk_regmap meson8b_hdmi_pll_dco = {
 			.shift   = 29,
 			.width   = 1,
 		},
+		.table = hdmi_pll_params_table,
 	},
 	.hw.init = &(struct clk_init_data){
 		/* sometimes also called "HPLL" or "HPLL PLL" */
-- 
2.30.0