On Wed, Jan 26, 2022 at 02:46:08PM +0100, Javier Martinez Canillas wrote: > On 1/26/22 14:12, Andy Shevchenko wrote: > > On Wed, Jan 26, 2022 at 12:26:36PM +0100, Greg Kroah-Hartman wrote: > >> On Wed, Jan 26, 2022 at 12:17:08PM +0100, Helge Deller wrote: > >>> On 1/26/22 11:31, Daniel Vetter wrote: > > > > ... > > > >>> You are describing a transitioning over to DRM - which is Ok. > >>> But on that way there is no need to ignore, deny or even kill usage scenarios > >>> which are different compared to your usage scenarios (e.g. embedded devices, > >>> old platforms, slow devices, slow busses, no 3D hardware features, > >>> low-color devices, ...). > >> > >> All of those should be handled by the drm layer, as Daniel keeps > >> pointing out. If not, then the tinydrm layer needs to be enhanced to do > >> so. > >> > >> Anyone have a pointer to hardware I can buy that is one of these fbtft > >> drivers that I could do a port to drm to see just how much work is > >> really needed here? > > > > I have bought myself (for other purposes, I mean not to convert the driver(s)) > > SSD1306 based display (SPI), SSD1331 (SPI), HX88347d (parallel). > > > > I've just bought a SSD1306 (I2C) based one and will attempt to write a DRM > driver using drivers/staging/fbtft/fb_ssd1306.c as a reference. You should take ssd1307fb.c instead. And basically create a MIPI based driver for I2C. Then we won't go same road again for other similar devices. > I didn't find one with a SPI interface but we can later add a transport for > that if I succeed. -- With Best Regards, Andy Shevchenko
