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([2a01:e0a:3d9:2080:d4c1:5589:eadb:1033]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4324eaa0908sm100780184f8f.31.2026.01.05.06.52.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 05 Jan 2026 06:52:12 -0800 (PST) Message-ID: Date: Mon, 5 Jan 2026 15:52:11 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: neil.armstrong@linaro.org Subject: Re: [PATCH RFC v1] drm/meson: venc: add support for HDMI DMT modes up to 3840x2160 To: Martin Blumenstingl , linux-amlogic@lists.infradead.org, dri-devel@lists.freedesktop.org References: <20251108134236.1299630-1-martin.blumenstingl@googlemail.com> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <20251108134236.1299630-1-martin.blumenstingl@googlemail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260105_065215_560498_15EBB1AF X-CRM114-Status: GOOD ( 21.10 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Neil Armstrong Cc: maarten.lankhorst@linux.intel.com, linux-kernel@vger.kernel.org, mripard@kernel.org, tzimmermann@suse.de, tobetter@gmail.com, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org On 11/8/25 14:42, Martin Blumenstingl wrote: > Commit 5d0bfe448481 ("drm/meson: Add HDMI 1.4 4k modes") added support > for HDMI 1.4 4k modes, which is what TVs need. For computer monitors > the code is using the DMT code-path, which ends up in > meson_venc_hdmi_supported_mode(), which does not allow the 4k modes yet. > > The datasheet for all supported SoCs mentions "4Kx2K@60". It's not > clear whether "4K" here means 3840 or 4096 pixels. > > Allow resolutions up to 3840x2160 pixels (including middle steps, such > as WQHD at 2560x1440 pixels) so they can be used with computer monitors > (using the DMT code-path in the driver). > > Signed-off-by: Martin Blumenstingl > --- > I'm sending this as RFC as I'm hoping to get some comments on the > "4Kx2K@60" note from the datasheets. > > I have tested it myself on a GXL Le Potato board using a computer > monitor at 2560x1440 pixels. > > This is the spiritual successor of a patch titled "drm/meson: add > support for 2560x1440 resolution output" from [0] > > [0] https://lore.kernel.org/linux-amlogic/20250927130239.825060-1-christianshewitt@gmail.com/ > > > drivers/gpu/drm/meson/meson_venc.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/meson/meson_venc.c b/drivers/gpu/drm/meson/meson_venc.c > index 3bf0d6e4fc30..4abd0c09b442 100644 > --- a/drivers/gpu/drm/meson/meson_venc.c > +++ b/drivers/gpu/drm/meson/meson_venc.c > @@ -868,10 +868,10 @@ meson_venc_hdmi_supported_mode(const struct drm_display_mode *mode) > DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC)) > return MODE_BAD; > > - if (mode->hdisplay < 400 || mode->hdisplay > 1920) > + if (mode->hdisplay < 400 || mode->hdisplay > 3840) > return MODE_BAD_HVALUE; > > - if (mode->vdisplay < 480 || mode->vdisplay > 1920) > + if (mode->vdisplay < 480 || mode->vdisplay > 2160) > return MODE_BAD_VVALUE; > > return MODE_OK; Acked-by: Neil Armstrong Thanks, Neil _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic