Hi Ivaylo, > Am 27.11.2020 um 19:44 schrieb Ivaylo Dimitrov <ivo.g.dimitrov.75@xxxxxxxxx>: > > Hi, > > On 27.11.20 г. 19:30 ч., Tomi Valkeinen wrote: >> On 27/11/2020 17:37, Ivaylo Dimitrov wrote: >>> With 5.9.11 and the patch on top, n900 boots fine, albeit display remains blank, could be related to >>> brightness, we're still investigating. >> Ok. A DSS regdump for a working version and the latest one would be good too. There's a omapdss >> debugfs dir, with dss, dispc and clk files which are of interest here. > > It turned out to be a long standing bug in the panel driver, with the bellow fix it works fine: > > > diff --git a/drivers/gpu/drm/panel/panel-sony-acx565akm.c b/drivers/gpu/drm/panel/panel-sony-acx565akm.c > index fc6a7e451abe..304267f7849a > --- a/drivers/gpu/drm/panel/panel-sony-acx565akm.c > +++ b/drivers/gpu/drm/panel/panel-sony-acx565akm.c > @@ -629,7 +629,7 @@ static int acx565akm_probe(struct spi_device *spi) > lcd->spi = spi; > mutex_init(&lcd->mutex); > > - lcd->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_LOW); > + lcd->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH); > if (IS_ERR(lcd->reset_gpio)) { > dev_err(&spi->dev, "failed to get reset GPIO\n"); > return PTR_ERR(lcd->reset_gpio); > > Proper patch will follow. I just found another issue which seems to hit a handful of SPI based panel drivers, for example the panel-tpo-td028ttec1. It is commit 766c6b63aa04 ("spi: fix client driver breakages when using GPIO descriptors") which breaks our DM3730 based GTA04 panel drivers/gpu/drm/panel/panel-tpo-td028ttec1.c. It may also affect other SPI based drivers if they are operated though spi-gpio (I would have to look up the N900 hardware setup). BR, Nikolaus _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel