kernel/linux.git/drivers/gpu/drm/sun4i/sun8i_vi_scaler.c, branch v6.19.11

drm/sun4i: layer: replace mixer with layer struct

2025-11-12T09:18:25+00:00

This allows to almost completely decouple layer code from mixer. This is important for DE33. Reviewed-by: Chen-Yu Tsai Tested-by: Ryan Walklin Signed-off-by: Jernej Skrabec Link: https://patch.msgid.link/20251104180942.61538-29-jernej.skrabec@gmail.com Signed-off-by: Chen-Yu Tsai

drm/sun4i: vi_scaler: Update DE33 base calculation

2025-11-12T09:18:24+00:00

Now that channel base calculation is straightforward, let's update VI scaler base calculation to be simpler. At the same time, also introduce macro to avoid magic numbers. Note, reason why current magic value and new macro value isn't the same is because sun8i_channel_base() already introduces offset to channel registers. Previous value is just the difference to VI scaler registers. However, new code calculates scaler base from channel base. This is also easier to understand when looking into BSP driver. Macro value can be easily found whereas old diff value was not. Reviewed-by: Chen-Yu Tsai Tested-by: Ryan Walklin Signed-off-by: Jernej Skrabec Link: https://patch.msgid.link/20251104180942.61538-24-jernej.skrabec@gmail.com Signed-off-by: Chen-Yu Tsai

drm/sun4i: layers: Make regmap for layers configurable

2025-11-12T09:18:23+00:00

Till DE33, there were no reason to decouple registers from mixer. However, with future new plane driver, this will be necessary. Reviewed-by: Chen-Yu Tsai Tested-by: Ryan Walklin Signed-off-by: Jernej Skrabec Link: https://patch.msgid.link/20251104180942.61538-21-jernej.skrabec@gmail.com Signed-off-by: Chen-Yu Tsai

drm/sun4i: vi_scaler: use layer instead of mixer for args

2025-11-12T09:18:23+00:00

Layer related peripherals should take layer struct as a input. This looks cleaner and also necessary for proper DE33 support later. Reviewed-by: Chen-Yu Tsai Tested-by: Ryan Walklin Signed-off-by: Jernej Skrabec Link: https://patch.msgid.link/20251104180942.61538-20-jernej.skrabec@gmail.com Signed-off-by: Chen-Yu Tsai

drm: sun4i: de33: vi_scaler: add Display Engine 3.3 (DE33) support

2025-06-02T07:59:10+00:00

The vi_scaler appears to be used in preference to the ui_scaler module for hardware video scaling in the DE33. Enable support for this scaler. Signed-off-by: Jernej Skrabec Signed-off-by: Ryan Walklin Acked-by: Maxime Ripard Reviewed-by: Chen-Yu Tsai Link: https://lore.kernel.org/r/20250528092431.28825-8-ryan@testtoast.com Signed-off-by: Maxime Ripard

drm: sun4i: de2/de3: add mixer version enum

2025-06-02T07:57:17+00:00

The Allwinner DE2 and DE3 display engine mixers are currently identified by a simple boolean flag. This will not scale to support additional DE variants. Convert the boolean flag to an enum. Signed-off-by: Jernej Skrabec Signed-off-by: Ryan Walklin Reviewed-by: Andre Przywara Acked-by: Maxime Ripard Reviewed-by: Chen-Yu Tsai Link: https://lore.kernel.org/r/20250528092431.28825-2-ryan@testtoast.com Signed-off-by: Maxime Ripard

drm/sun4i: Add basic support for DE3

2018-11-05T10:48:23+00:00

Display Engine 3 is an upgrade of DE2 with new features like support for 10 bit color formats and support for AFBC. Most of DE2 code works with DE3, except some small details. Implement basic support for DE3. Support for 10 bit colort formats and AFBC, among others missing features, will be added later. Signed-off-by: Jernej Skrabec Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/260238/

drm/sun4i: Rework DE2 register defines

2018-11-05T09:34:43+00:00

Most, if not all, registers found in DE2 still exists in DE3. However, units are on different base addresses. To prepare for addition of DE3 support, registers macros are reworked so they take base address as parameter. Signed-off-by: Jernej Skrabec [rebased] Signed-off-by: Icenowy Zheng Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20181104182705.18047-10-jernej.skrabec@siol.net

drm/sun4i: Expand DE2 scaler lib with YUV support

2017-12-05T12:22:44+00:00

Basic principle of operation when using YUV framebuffer is that chroma planes have to be upscaled to same size as luma. Because of that, expand DE2 scaler library to support that. BSP driver uses another set of FIR filter coefficients for YUV planes. Signed-off-by: Jernej Skrabec Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20171201060550.10392-26-jernej.skrabec@siol.net

drm/sun4i: Add support for HW scaling to DE2

2017-12-05T12:22:44+00:00

Scaling is currently supported only for RGB framebuffers Coefficients and algorithm which coefficients to select are taken from BSP driver. Signed-off-by: Jernej Skrabec Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20171201060550.10392-22-jernej.skrabec@siol.net