4a7224c41f
- B9A: read-only audit of stock LK/DT: the panel is an ST7735S 128x128 on SPI (BLSP1 QUP4, 16 MHz, mode 3, D/C GPIO116, RESET GPIO118), backlight = PM8916 MPP4 current sink 40 mA. - B9B: upstream panel-mipi-dbi with the stock init sequence as firmware; MPP4 sink via pinctrl + gpio-backlight; first light with correct colours/orientation/offsets. - B9C: fbcon (6x8, 21x16) on tty1 + getty, UART console kept, aurora-display service; cache B9C b9ce13c9 written and verified, cold boots with LTE + Wi-Fi + display. - B9L (RAM only): lk2nd second stage with an msm8916 SPI panel port shows a picture before Linux. - Sanitizer: whitelist for b8/ and b9/.
44 lines
2.6 KiB
Bash
Executable file
44 lines
2.6 KiB
Bash
Executable file
#!/bin/sh
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# Aurora display controller (B9C). ST7735S on SPI via panel-mipi-dbi (DRM) -> fb0 -> fbcon (tty1) + MPP4 backlight.
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# aurora-display start : wait for fb0, make sure the display pipe is enabled (fbcon takeover modeset, or one fbdev
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# unblank if nothing enabled it), then switch the backlight on through the gpio-backlight driver.
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# aurora-display status : one-line state summary
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# aurora-display bl on|off
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# Never writes PMIC/GPIO registers directly: only fb0 'blank' and backlight sysfs attributes of the kernel drivers.
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D=/run/aurora-display; L=$D/display.log; mkdir -p $D
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FB=/sys/class/graphics/fb0; CON=/sys/class/drm/card0-SPI-1; BL=/sys/class/backlight/backlight
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t() { cut -d' ' -f1 /proc/uptime; }
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log() { echo "[$(t)] $*" >> $L; echo "[aurora-display] $*" > /dev/kmsg 2>/dev/null; }
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fbcon_bound() { for v in /sys/class/vtconsole/vtcon*; do grep -q "frame buffer" $v/name 2>/dev/null && [ "$(cat $v/bind)" = 1 ] && return 0; done; return 1; }
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l17_users() { for r in /sys/class/regulator/regulator.*; do [ "$(cat $r/name 2>/dev/null)" = l17 ] && { cat $r/num_users; return; }; done; echo 0; }
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pipe_on() { [ "$(cat $CON/enabled 2>/dev/null)" = enabled ] && [ "$(cat $CON/dpms 2>/dev/null)" = On ] && [ "$(l17_users)" -ge 1 ]; }
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state() { echo "fb0=$([ -e $FB ] && cat $FB/name) fbcon=$(fbcon_bound && echo bound || echo no) conn=$(cat $CON/enabled 2>/dev/null)/$(cat $CON/dpms 2>/dev/null) l17_users=$(l17_users) bl_power=$(cat $BL/bl_power 2>/dev/null) bl=$(cat $BL/actual_brightness 2>/dev/null)"; }
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wait_for() { n=$1; shift; i=0; until "$@"; do i=$((i+1)); [ $i -ge $n ] && return 1; sleep 0.2; done; }
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bl() {
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[ -d $BL ] || { log "FAIL: no backlight device"; return 1; }
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case $1 in
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on) echo 0 > $BL/bl_power; echo 1 > $BL/brightness;;
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off) echo 0 > $BL/brightness;;
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esac
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log "backlight $1 -> bl_power=$(cat $BL/bl_power) actual_brightness=$(cat $BL/actual_brightness)"
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}
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case "$1" in
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start)
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log "start: $(state)"
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wait_for 100 test -e $FB || { log "FAIL: fb0 did not appear within 20 s"; exit 1; }
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fbcon_bound && log "fbcon bound to fb0" || log "fbcon NOT bound (no framebuffer console)"
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if wait_for 25 pipe_on; then
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log "display pipe already enabled (by fbcon takeover) - no unblank needed"
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else
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log "display pipe not enabled -> fbdev unblank"
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echo 0 > $FB/blank
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wait_for 25 pipe_on || { log "FAIL: pipe still not enabled after unblank: $(state)"; exit 1; }
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log "display pipe enabled by unblank"
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fi
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bl on
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[ "$(cat $BL/actual_brightness)" = 1 ] || { log "FAIL: backlight did not turn on: $(state)"; exit 1; }
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log "=== DISPLAY READY $(state)";;
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status) state;;
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bl) bl "$2";;
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*) echo "usage: $0 start|status|bl on|off"; exit 2;;
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esac
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