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[2a02:3100:afbb:db00:1e86:bff:fe2f:57b7]) by smtp.googlemail.com with ESMTPSA id a640c23a62f3a-b842a4d3831sm1263505666b.44.2026.01.09.12.48.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Jan 2026 12:48:44 -0800 (PST) From: Martin Blumenstingl To: linux-amlogic@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, airlied@gmail.com, tzimmermann@suse.de, mripard@kernel.org, maarten.lankhorst@linux.intel.com, neil.armstrong@linaro.org, Martin Blumenstingl Subject: [PATCH] drm/meson: add support for higher bandwidth HDMI DTDs Date: Fri, 9 Jan 2026 21:48:36 +0100 Message-ID: <20260109204836.790096-1-martin.blumenstingl@googlemail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" There's a report from a user with a DELL U3415W monitor and a Khadas VIM3 stating that 3440x1440@50Hz works but 3440x1440@60Hz doesn't. edid-decode Detailed Timing Descriptor (DTD) extract of that mode: DTD 1: 3440x1440 59.972616 Hz 43:18 88.819 kHz 319.750000 MHz Hfront 80 Hsync 32 Hback 48 Hpol P Vfront 28 Vsync 10 Vback 3 Vpol N Those high clock rates are currently not supported by the meson_vclk code as it limits the PLL OD (output divider) to a minimum of 2. The formula to calculate the clock internally is (ignoring fractional dividers): 319.750MHz * 10 * od =3D 24MHz * m With od =3D 2 this results in m =3D 266, which is outside the supported range of the PLL on G12A SoCs (the driver limits m to 106..247). Using od =3D 2 results in m =3D 133, which is supported. Allow the driver to pick OD =3D 1 to gain support for modes such as 3440x1440@60Hz. Link: https://forum.khadas.com/t/can-not-set-display-resolution-to-3440x144= 0-for-dell-monitor/26271/12 Signed-off-by: Martin Blumenstingl --- drivers/gpu/drm/meson/meson_vclk.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/meson/meson_vclk.c b/drivers/gpu/drm/meson/mes= on_vclk.c index dfe0c28a0f05..c0be0b7655bf 100644 --- a/drivers/gpu/drm/meson/meson_vclk.c +++ b/drivers/gpu/drm/meson/meson_vclk.c @@ -700,8 +700,8 @@ static bool meson_hdmi_pll_find_params(struct meson_drm= *priv, unsigned int *frac, unsigned int *od) { - /* Cycle from /16 to /2 */ - for (*od =3D 16 ; *od > 1 ; *od >>=3D 1) { + /* Cycle from /16 to /1 */ + for (*od =3D 16 ; *od > 0 ; *od >>=3D 1) { *m =3D meson_hdmi_pll_get_m(priv, freq * *od); if (!*m) continue; @@ -750,7 +750,7 @@ static void meson_hdmi_pll_generic_set(struct meson_drm= *priv, /* OD2 goes to the PHY, and needs to be *10, so keep OD3=3D1 */ od3 =3D 1; if (od < 4) { - od1 =3D 2; + od1 =3D od; od2 =3D 1; } else { od2 =3D od / 4; --=20 2.52.0