linux-kernel - Re: 4.13 (and probably all recent) kernels refuse to boot on one Nokia N950, work or another

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Date:   Mon, 30 Oct 2017 08:51:35 +0100
From:   Pavel Machek <pavel@....cz>
To:     Sebastian Reichel <sre@...nel.org>
Cc:     Tony Lindgren <tony@...mide.com>, pali.rohar@...il.com,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com,
        clayton@...ftyguy.net, martijn@...xit.nl,
        sakari.ailus@...ux.intel.com, filip.matijevic.pz@...il.com
Subject: Re: 4.13 (and probably all recent) kernels refuse to boot on one
 Nokia N950, work or another

Hi!

> > I got "uncompressing Linux 4.13" on serial console now, debug LEDs
> > blinking, and if I use a flashlight, I see output on the screen, too.
> > 
> > (What do I need to do to get the backlight working?)
> 
> Glad you got it working :) For backlight you can add this
> in drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c:
> 
> add the following code at the end of dsicm_probe:
> 
> -----------------------------------------------------------
> mutex_unlock(&ddata->lock);
> mutex_lock(&ddata->lock);
> ddata->in->ops.dsi->bus_lock(ddata->in);
> r = dsicm_wake_up(ddata);
> if (!r)
>     r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 100);
> ddata->in->ops.dsi->bus_unlock(ddata->in);
> mutex_unlock(&ddata->lock);
> -----------------------------------------------------------

That one did not work; but after some help from Filip, this did:

Best regards,
									Pavel

diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
index b5ea8e5..2cb74cc 100644
--- a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
+++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
@@ -385,7 +385,7 @@ static int dsicm_bl_update_status(struct backlight_device *dev)
 
 		r = dsicm_wake_up(ddata);
 		if (!r)
-			r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level);
+			r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff /* level */);
 
 		in->ops.dsi->bus_unlock(in);
 	}


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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