lwn.git/drivers/gpu/drm/meson/meson_venc.c, branch docs-next

drm/meson: venc: add support for HDMI DMT modes up to 3840x2160

2026-01-05T15:09:57+00:00

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 Acked-by: Neil Armstrong Signed-off-by: Neil Armstrong Link: https://patch.msgid.link/20251108134236.1299630-1-martin.blumenstingl@googlemail.com

drm/meson: venc: include linux/bitfield.h

2023-06-02T13:47:52+00:00

Without this header, the use of FIELD_PREP() can cause a build failure: drivers/gpu/drm/meson/meson_venc.c: In function 'meson_encl_set_gamma_table': drivers/gpu/drm/meson/meson_venc.c:1595:24: error: implicit declaration of function 'FIELD_PREP' [-Werror=implicit-function-declaration] Fixes: 51fc01a03442c ("drm/meson: venc: add ENCL encoder setup for MIPI-DSI output") Signed-off-by: Arnd Bergmann Acked-by: Neil Armstrong Signed-off-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/20230602124539.894888-1-arnd@kernel.org

drm/meson: venc: add ENCL encoder setup for MIPI-DSI output

2023-06-01T14:10:22+00:00

This adds supports for the ENCL encoder connected to a MIPI-DSI transceiver on the Amlogic AXG, G12A, G12B & SM1 SoCs. Signed-off-by: Neil Armstrong Reviewed-by: Nicolas Belin Tested-by: Nicolas Belin # on Khadas VIM3 + TS050 Panel Signed-off-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/20230512-amlogic-v6-4-upstream-dsi-ccf-vim3-v5-10-56eb7a4d5b8e@linaro.org

drm/meson: set variables meson_hdmi_* storage-class-specifier to static

2023-04-27T12:48:48+00:00

smatch has several similar warnings to drivers/gpu/drm/meson/meson_venc.c:189:28: warning: symbol 'meson_hdmi_enci_mode_480i' was not declared. Should it be static? These variables are only used in their defining file so should be static Signed-off-by: Tom Rix Acked-by: Martin Blumenstingl Signed-off-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/20230423145300.3937831-1-trix@redhat.com

drm/meson/meson_venc: Relax the supported mode checks

2023-03-06T08:44:08+00:00

Relax a bit the supported modes list by including also 480x1920 and 400x1280. This was actually tested on real hardware and it works correctly. Signed-off-by: Carlo Caione Reviewed-by: Neil Armstrong Signed-off-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/20230210-relax_dmt_limits-v2-1-318913f08121@baylibre.com

drm/meson: Fix few typo

2021-03-19T09:40:54+00:00

s/initialy/initially/ s/desined/designed/ Signed-off-by: Bhaskar Chowdhury Acked-by: Randy Dunlap Signed-off-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/20210318110046.14830-1-unixbhaskar@gmail.com

drm/meson/meson_venc: Make local function 'meson_venc_hdmi_get_dmt_vmode' static

2020-11-17T17:34:14+00:00

Fixes the following W=1 kernel build warning(s): drivers/gpu/drm/meson/meson_venc.c:893:6: warning: no previous prototype for ‘meson_venc_hdmi_get_dmt_vmode’ [-Wmissing-prototypes] Cc: Neil Armstrong Cc: David Airlie Cc: Daniel Vetter Cc: Kevin Hilman Cc: Jerome Brunet Cc: Martin Blumenstingl Cc: dri-devel@lists.freedesktop.org Cc: linux-amlogic@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Lee Jones Reviewed-by: Neil Armstrong Signed-off-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20201116174112.1833368-14-lee.jones@linaro.org

drm/meson: venc: add support for YUV420 setup

2020-03-10T09:51:24+00:00

This patch adds encoding support for the YUV420 output from the Amlogic Meson SoCs Video Processing Unit to the HDMI Controller. The YUV420 is obtained by generating a YUV444 pixel stream like the classic HDMI display modes, but then the Video Encoder output can be configured to down-sample the YUV444 pixel stream to a YUV420 stream. In addition if pixel stream down-sampling, the Y Cb Cr components must also be mapped differently to align with the HDMI2.0 specifications. Signed-off-by: Neil Armstrong Reviewed-by: Jernej Škrabec Link: https://patchwork.freedesktop.org/patch/msgid/20200304104052.17196-10-narmstrong@baylibre.com

drm/meson: venc: make drm_display_mode const

2020-03-10T09:51:24+00:00

Before switching to bridge funcs, make sure drm_display_mode is passed as const to the venc functions. Signed-off-by: Neil Armstrong Reviewed-by: Boris Brezillon Acked-by: Laurent Pinchart Reviewed-by: Jernej Škrabec Link: https://patchwork.freedesktop.org/patch/msgid/20200304104052.17196-7-narmstrong@baylibre.com

drm: meson: use match data to detect vpu compatibility

2019-08-22T15:54:05+00:00

This patch introduce new enum which contains all VPU family (GXBB, GXL, GXM and G12A). This enum is used to detect the VPU compatible with the device. We only need to set .data to the corresponding enum in the device table, no need to check .compatible string anymore. Signed-off-by: Julien Masson Tested-by: Neil Armstrong Acked-by: Neil Armstrong Signed-off-by: Neil Armstrong Link: https://patchwork.freedesktop.org/patch/msgid/87imqpz21w.fsf@masson.i-did-not-set--mail-host-address--so-tickle-me