linux-kernel - [PATCH] drm/meson: add support for 2560x1440 resolution output

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Message-Id: <20250927130239.825060-1-christianshewitt@gmail.com>
Date: Sat, 27 Sep 2025 13:02:39 +0000
From: Christian Hewitt <christianshewitt@...il.com>
To: Neil Armstrong <neil.armstrong@...aro.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Kevin Hilman <khilman@...libre.com>,
	Jerome Brunet <jbrunet@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	dri-devel@...ts.freedesktop.org,
	linux-amlogic@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Dongjin Kim <tobetter@...il.com>
Subject: [PATCH] drm/meson: add support for 2560x1440 resolution output

From: Dongjin Kim <tobetter@...il.com>

Add support for Quad HD (QHD) 2560x1440 resolution output. Timings
have been adapted from the vendor kernel.

Signed-off-by: Dongjin Kim <tobetter@...il.com>
Signed-off-by: Christian Hewitt <christianshewitt@...il.com>
---
 drivers/gpu/drm/meson/meson_vclk.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/meson/meson_vclk.c b/drivers/gpu/drm/meson/meson_vclk.c
index dfe0c28a0f05..f5385b3e3796 100644
--- a/drivers/gpu/drm/meson/meson_vclk.c
+++ b/drivers/gpu/drm/meson/meson_vclk.c
@@ -357,6 +357,8 @@ enum {
 	MESON_VCLK_HDMI_594000,
 /* 2970 /1 /1 /1 /5 /1  => /1 /2 */
 	MESON_VCLK_HDMI_594000_YUV420,
+/* 4830 /2 /1 /2 /5 /1  => /1 /1 */
+	MESON_VCLK_HDMI_241500,
 };
 
 struct meson_vclk_params {
@@ -467,6 +469,18 @@ struct meson_vclk_params {
 		.vid_pll_div = VID_PLL_DIV_5,
 		.vclk_div = 1,
 	},
+	[MESON_VCLK_HDMI_241500] = {
+		.pll_freq = 4830000000,
+		.phy_freq = 2415000000,
+		.venc_freq = 241500000,
+		.vclk_freq = 241500000,
+		.pixel_freq = 241500000,
+		.pll_od1 = 2,
+		.pll_od2 = 1,
+		.pll_od3 = 2,
+		.vid_pll_div = VID_PLL_DIV_5,
+		.vclk_div = 1,
+	},
 	{ /* sentinel */ },
 };
 
@@ -894,6 +908,10 @@ static void meson_vclk_set(struct meson_drm *priv,
 			m = 0xf7;
 			frac = vic_alternate_clock ? 0x8148 : 0x10000;
 			break;
+		case 4830000:
+			m = 0xc9;
+			frac = 0xd560;
+			break;
 		}
 
 		meson_hdmi_pll_set_params(priv, m, frac, od1, od2, od3);
-- 
2.34.1