SM8550: switch Pocket DS lower panel to mainline ST7703 driver#3051
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SM8550: switch Pocket DS lower panel to mainline ST7703 driver#3051Azkali wants to merge 3 commits into
Azkali wants to merge 3 commits into
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added 3 commits
July 23, 2026 18:21
The lower panel was carried as a generated standalone driver (panel-ar11-5inch.c, DRM_PANEL_AR11_5INCH) with a FIXME author that did not identify the DDIC. Its init sequence is in fact a Sitronix ST7703 command set: SETEXTC 0xB9 unlock (f1 12 87), SETMIPI 0xBA, SETRGBIF, SETGIP1/2 0xE9/0xEA, every opcode mapping 1:1 to panel-sitronix-st7703, with the SETMIPI/SETRGBIF payloads near-identical to the Powkiddy RGB10MAX3. Replace the bespoke driver with an extension of the in-tree sitronix-st7703 driver: add the ayaneo,pocket-ds-lower-panel compatible, init sequence, mode and desc, plus the binding enum entry. This is the same pattern the anbernic/powkiddy/gameforce ST7703 panels already use. Validated on real Pocket DS hardware: the lower panel comes up at 768x1024@60 driven by sitronix-st7703. Signed-off-by: Alexandre Hamamdjian <azkali.limited@gmail.com>
The lower panel is now driven by sitronix-st7703 via the
"ayaneo,pocket-ds-lower-panel" compatible. That driver's DT contract is
vcc-supply + iovcc-supply + reset-gpios, not the generator's avdd + an
enable-gpio, so re-express the wiring:
- vcc-supply -> the SGM3804 charge pump (the "panel-avdd" rail),
- iovcc-supply -> a fixed regulator wrapping the expander GPIO that
previously drove enable-gpio,
- reset-gpios -> unchanged.
The enable line only gates a board rail, so modelling it as a fixed
regulator (as vdd_ts already does for the touch controller) keeps the
prepare/enable ordering the vendor driver relied on. The iovcc level is
the ST7703 IOVCC nominal and should be confirmed on hardware.
Signed-off-by: Alexandre Hamamdjian <azkali.limited@gmail.com>
The lower panel now uses the mainline sitronix-st7703 driver instead of the removed standalone panel-ar11-5inch.c, so enable CONFIG_DRM_PANEL_SITRONIX_ST7703 and drop the now-nonexistent CONFIG_DRM_PANEL_AR11_5INCH. Signed-off-by: Alexandre Hamamdjian <azkali.limited@gmail.com>
Azkali
marked this pull request as ready for review
July 23, 2026 11:53
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Summary
The AYANEO Pocket DS lower panel is currently carried as an auto-generated
standalone driver (
patches/linux/0053-gpu-panel-add-Pocket-DS-lower-panel-driver.patch→
panel-ar11-5inch.c,CONFIG_DRM_PANEL_AR11_5INCH) with aFIXMEauthorthat never identified the DDIC. It is a Sitronix ST7703, and this PR replaces
the bespoke driver with an extension of the in-tree
panel-sitronix-st7703driver — the same pattern the anbernic / powkiddy / gameforce ST7703 panels
already use upstream.
DDIC identification (Sitronix ST7703)
The generated init sequence is an ST7703 manufacturer command set:
0xB9 f1 12 87— SETEXTC unlock.B9 F1 12is the canonical ST7703 key;the trailing byte is a vendor variant (
0x87here vs the usual0x83), keptverbatim.
0xBASETMIPI,0xB3SETRGBIF,0xC0SETSCR,0xC1SETPOWER,0xE0SETGAMMA,0xE9/0xEASETGIP1/2 — every opcode maps 1:1 to anST7703_CMD_*inpanel-sitronix-st7703.c.supported Powkiddy RGB10MAX3 ST7703 panel.
What changed
ayaneo,pocket-ds-lower-paneltopanel-sitronix-st7703.c(init sequence,mode,
st7703_panel_desc,of_matchentry, plus oneST7703_CMD_UNKNOWN_E1define) and to the
rocktech,jh057n00900.yamlbinding enum.qcs8550-ayaneo-pocketds.dts): re-model the panel rails to theST7703 driver contract —
avdd-supply→vcc-supply(same SGM3804panel-avddcharge pump), and the formerenable-gpiobecomes a fixedregulator referenced as
iovcc-supply(modelled like the existingvdd_tsregulator).
reset-gpios,rotation = <270>,backlightand the portendpoint are unchanged.
linux.aarch64.conf): enableCONFIG_DRM_PANEL_SITRONIX_ST7703, dropCONFIG_DRM_PANEL_AR11_5INCH.Validation
Validated on real Pocket DS hardware: both screens light up, the lower panel
comes up at 768x1024@60 driven by
sitronix-st7703(rails re-modelled to thevcc/iovcc contract).
Notes for reviewers
7.1.2, per
projects/ROCKNIX/packages/linux/package.mk):git apply --checkapplies with zero offset/fuzz to the pristine
panel-sitronix-st7703.candrocktech,jh057n00900.yaml. No other SM8550 patch touches either file, so itapplies at patch-time as well.
iovccregulator level is set to the ST7703 IOVCC nominal (1.8 V); itgates the same expander GPIO the old
enable-gpiodrove and wants a finalconfirmation against the board schematic.