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); > ----------------------------------------------------------- Ok, I tried that, and did not help. I also tried removing first mutex_unlock(), since that's unbalanced and strange. Did not work. So I commented it out with #if 0, and tried more hacks, but no luck :-(. (I still see the display.. but no backlight so reading it is .. difficult.) 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 8f74633..c0bbb42 100644 --- a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c +++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c @@ -668,6 +668,7 @@ static int dsicm_power_on(struct panel_drv_data *ddata) goto err; r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff); + mdelay(1000); if (r) goto err; @@ -703,6 +704,8 @@ static int dsicm_power_on(struct panel_drv_data *ddata) in->ops.dsi->enable_hs(in, ddata->channel, true); + r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff); + return 0; err: dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n"); @@ -1396,6 +1399,15 @@ static int dsicm_probe(struct platform_device *pdev) goto err_bl; } +#if 0 + 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); +#endif return 0; err_bl: -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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