[PATCH] drm: hdlcd: allow HDLCD to be used without interrupt
From: Vladimir Murzin <hidden>
Date: 2017-08-21 14:45:21
Also in:
dri-devel, linux-devicetree
Subsystem:
arm mali-dp drm driver, drm drivers, drm drivers and misc gpu patches, the rest · Maintainers:
Liviu Dudau, David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2017-08-30 · Re: [PATCH] drm: hdlcd: allow HDLCD to be used without interrupt · Russell King - ARM Linux <hidden>
- 2017-08-30 · Re: [PATCH] drm: hdlcd: allow HDLCD to be used without interrupt · Liviu Dudau <hidden>
- 2017-08-29 · Re: [PATCH] drm: hdlcd: allow HDLCD to be used without interrupt · Russell King - ARM Linux <hidden>
- 2017-08-29 · Re: [PATCH] drm: hdlcd: allow HDLCD to be used without interrupt · Liviu Dudau <liviu.dudau@arm.com>
- 2017-08-24 · Re: [PATCH] drm: hdlcd: allow HDLCD to be used without interrupt · Liviu Dudau <hidden>
On 10/08/17 13:15, Vladimir Murzin wrote:
On 26/07/17 11:27, Russell King - ARM Linux wrote:quoted
I suspect the above failure is down to either (a) not having enough memory available to allocate a 1920x1080 frame buffer, or (b) not (yet) being able to program the hdlcd pixel clock for this platform, which is currently hard-coded in DT at 23.75MHz.Given it is NOMMU it is likely (a). Usually, tweaking FORCE_MAX_ZONEORDER helped me in such cases.
Ok, with CONFIG_FORCE_MAX_ZONEORDER=12 I see [ 5.242423] [drm] found ARM HDLCD version r0p0 [ 5.493835] tda998x 2-0070: found TDA19988 [ 5.527771] hdlcd 40205000.hdlcd: bound 2-0070 (ops 0x1470f8) [ 5.535819] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 5.543478] [drm] No driver support for vblank timestamp query. [ 7.443189] hdlcd 40205000.hdlcd: fb0: frame buffer device [ 7.501975] [drm] Initialized hdlcd 1.0.0 20151021 for 40205000.hdlcd on minor 0 when display is connected. To make fb-test [1] happy I had to apply following diff:
diff --git a/drivers/gpu/drm/arm/Kconfig b/drivers/gpu/drm/arm/Kconfig
index 9a18e1b..d4cb1b1 100644
--- a/drivers/gpu/drm/arm/Kconfig
+++ b/drivers/gpu/drm/arm/Kconfig@@ -10,6 +10,7 @@ config DRM_HDLCD select DRM_ARM select DRM_KMS_HELPER select DRM_KMS_CMA_HELPER + select FB_PROVIDE_GET_FB_UNMAPPED_AREA if !MMU help Choose this option if you have an ARM High Definition Colour LCD controller.
(The only user of FB_PROVIDE_GET_FB_UNMAPPED_AREA is NOMMU only drivers/gpu/drm/stm/) However, I do not see anything on the screen. I'm probably missing something obvious, so if you have an idea, please let me know and I can test the patch. [1] https://github.com/prpplague/fb-test-app.git Thanks Vladimir
Cheers Vladimir _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel at lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel