linux-kernel - [PATCH 3/6] clk: meson: meson8b: Add the HDMI PLL M/N parameters

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210713232510.3057750-4-martin.blumenstingl@googlemail.com>
Date:   Wed, 14 Jul 2021 01:25:07 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     linux-amlogic@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, jbrunet@...libre.com,
        narmstrong@...libre.com,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH 3/6] 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
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 | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/clk/meson/meson8b.c b/drivers/clk/meson/meson8b.c
index 9ccffbfe44e5..8f29d26ed726 100644
--- a/drivers/clk/meson/meson8b.c
+++ b/drivers/clk/meson/meson8b.c
@@ -118,6 +118,27 @@ static struct clk_regmap meson8b_fixed_pll = {
 	},
 };
 
+static const struct pll_params_table hdmi_pll_params_table[] = {
+	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 +171,7 @@ 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" */
-- 
2.32.0