Hi Jagan, Marek, Am 07.09.22 um 12:04 schrieb Marek Szyprowski: > Hi Jagan, > > On 06.09.2022 21:07, Jagan Teki wrote: >> On Mon, Sep 5, 2022 at 4:54 PM Marek Szyprowski >> <m.szyprowski@xxxxxxxxxxx> wrote: >>> On 02.09.2022 12:47, Marek Szyprowski wrote: >>>> On 29.08.2022 20:40, Jagan Teki wrote: >>>>> Samsung MIPI DSIM controller is common DSI IP that can be used in >>>>> various >>>>> SoCs like Exynos, i.MX8M Mini/Nano. >>>>> >>>>> In order to access this DSI controller between various platform SoCs, >>>>> the ideal way to incorporate this in the drm stack is via the drm bridge >>>>> driver. >>>>> >>>>> This patch is trying to differentiate platform-specific and bridge >>>>> driver >>>>> code and keep maintaining the exynos_drm_dsi.c code as platform-specific >>>>> glue code and samsung-dsim.c as a common bridge driver code. >>>>> >>>>> - Exynos specific glue code is exynos specific te_irq, host_attach, and >>>>> detach code along with conventional component_ops. >>>>> >>>>> - Samsung DSIM is a bridge driver which is common across all >>>>> platforms and >>>>> the respective platform-specific glue will initialize at the end >>>>> of the >>>>> probe. The platform-specific operations and other glue calls will >>>>> invoke >>>>> on associate code areas. >>>>> >>>>> v4: >>>>> * include Inki Dae in MAINTAINERS >>>>> * remove dsi_driver probe in exynos_drm_drv to support multi-arch build >>>> This breaks Exynos DRM completely as the Exynos DRM driver is not able >>>> to wait until the DSI driver is probed and registered as component. >>>> >>>> I will show how to rework this the way it is done in >>>> drivers/gpu/drm/exynos/exynos_dp.c and >>>> drivers/gpu/drm/bridge/analogix/analogix_dp_core.c soon... >>> I've finally had some time to implement such approach, see >>> https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fprotect2.fireeye.com%2Fv1%2Furl%3Fk%3Dc5d024d9-a4ab8e4e-c5d1af96-74fe4860001d-625a8324a9797375%26q%3D1%26e%3D489b94d4-84fb-408e-b679-a8d27acf2930%26u%3Dhttps%253A%252F%252Fgithub.com%252Fmszyprow%252Flinux%252Ftree%252Fv6.0-dsi-v4-reworked&data=05%7C01%7Cfrieder.schrempf%40kontron.de%7C8ed9bd90703b48c9d43708da90b86876%7C8c9d3c973fd941c8a2b1646f3942daf1%7C0%7C0%7C637981418959345104%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=vLwOMBbdNo1C5x%2BESY3SU%2FwaYKBmAgIyafLOLmd3BlM%3D&reserved=0 >>> >>> If you want me to send the patches against your v4 patchset, let me >>> know, but imho my changes are much more readable after squashing to the >>> original patches. >>> >>> Now the driver is fully multi-arch safe and ready for further >>> extensions. I've removed the weak functions, reworked the way the >>> plat_data is used (dropped the patch related to it) and restored >>> exynos-dsi driver as a part of the Exynos DRM drivers/subsystem. Feel >>> free to resend the above as v5 after testing on your hardware. At least >>> it properly works now on all Exynos boards I have, both compiled into >>> the kernel or as modules. >> Thanks. I've seen the repo added on top of Dave patches - does it mean >> these depends on Dave changes as well? > > Yes and no. My rework doesn't change anything with this dependency. It > comes from my patch "drm: exynos: dsi: Restore proper bridge chain > order" already included in your series (patch #1). Without it exynos-dsi > driver hacks the list of bridges to ensure the order of pre_enable calls > needed for proper operation. This works somehow with DSI panels on my > test systems, but it has been reported that it doesn't work with a bit > more complex display pipelines. Only that patch depends on the Dave's > patches. If you remove it, you would need to adjust the code in the > exynos_drm_dsi.c and samsung-dsim.c respectively. imho it would be > better to keep it and merge Dave's patches together with dsi changes, as > they are the first real client of it. I tried to test Jagan's v4 on our Kontron BL i.MX8MM with SN65DSI84 LVDS bridge and it didn't work due to driver dependency issues. Instead trying Marek's branch rebased to 6.0-rc4 and including the necessary DT changes from Jagan's v4 looks good and produces an image on the display. Only one thing caused problems: In Jagan's patch for the LCDIF node [1] there's a typo (missing 's') in the assigned-clock-rates property. Without fixing this the display doesn't work. Jagan, can you come up with a v5 including Marek's fixes? And if you like, I think you could also start sending the DT changes for i.MX8MM, so we can start reviewing/testing them? Thanks Frieder [1]: https://github.com/openedev/kernel/commit/89a6252cec47f3593d4f2b7ea3132f4745c4fdb3
