Consensus on the mailing lists is that panels shouldn't use a table of
init commands but should instead use init functions. With the recently
introduced mipi_dsi_dcs_write_seq_multi() this is not only clean/easy
but also saves space. Measuring before/after this change:
$ scripts/bloat-o-meter \
.../before/panel-ilitek-ili9882t.ko \
.../after/panel-ilitek-ili9882t.ko
add/remove: 3/2 grow/shrink: 0/2 up/down: 6834/-8177 (-1343)
Function old new delta
starry_ili9882t_init - 6152 +6152
starry_ili9882t_init.d - 678 +678
ili9882t_disable.d - 4 +4
ili9882t_disable 260 228 -32
ili9882t_prepare 540 396 -144
.compoundliteral 681 - -681
starry_ili9882t_init_cmd 7320 - -7320
Total: Before=11928, After=10585, chg -11.26%
Let's do the conversion.
Since we're touching all the tables, let's also convert hex numbers to
lower case as per kernel conventions.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20240514102056.v5.8.I407b977f9508573103491df549dfaffc3688db13@changeid
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240514102056.v5.8.I407b977f9508573103491df549dfaffc3688db13@changeid
At present, we have found that there may be a problem of blurred
screen during fast sleep/resume. The direct cause of the blurred
screen is that the IC does not receive 0x28/0x10. Because of the
particularity of the IC, before the panel enters sleep hid must
stop scanning, as i2c_hid_core_suspend before ili9882t_disable.
If move the ili9882t_enter_sleep_mode function to ili9882t_unprepare,
touch reset will pull low before panel entersleep, which does not meet
the timing requirements.. So in order to solve this problem, the IC
can handle it through the exception mechanism when it cannot receive
0x28/0x10 command. Handling exceptions requires a reset 50ms delay.
Refer to vendor detailed analysis [1].
Ilitek vendor also suggested switching the page before entering sleep to
avoid panel IC not receiving 0x28/0x10 command.
Note: 0x28 is display off, 0x10 is sleep in.
[1]: https://github.com/ILITEK-LoganLin/Document/tree/main/ILITEK_Power_Sequence
Signed-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231013091844.804310-3-yangcong5@huaqin.corp-partner.google.com
