drm/panel: s6e8aa5x01-ams497hy01 Samsung J5 backlight support

[chr-chr]

trafficstars

The code was shamelessly stolen from ams520kt01, seems to work the same way. The data was mined from downstream.

Tested, works for me.

[stephan-gh]

@Grimler91 Do you mind taking a look at these changes?

[chr-chr]

f this ... I donate a space ...

[wonderfulShrineMaidenOfParadise]

Not J5X, but I would like to cc @B83C

[chr-chr]

Not J5X, but I would like to cc @B83C

? J5x having AMS520KT01 no?

[chr-chr]

Oo,

found some bug that shall be fixed ;)

[chr-chr]

code cleanup. @B83C: I guess the ams520kt01 can use this aswell. So stop copy and paste mistakes from each other. I guess the Author was oversleept like me ;)

 static int s6e8aa5x01_ams497hy01_enable(struct drm_panel *panel)
 {
...
        if (ctx->prepared)
                return 0;

Whats left? Actually one brightness cmd takes up to 400ms and when juggling a brightness slider I occasional get:

dsi_err_worker: status=4

but that did not hurt so far.

@B83C: I'd like some enlightenment on the Temp1? / Temp2? cmds ... do we need them?!