diff mbox series

[v3] drm/rockchip: Disable AFBC for res >2560 on rk3399

Message ID 20250417042008.28536-1-mail@etehtsea.me (mailing list archive)
State New
Headers show
Series [v3] drm/rockchip: Disable AFBC for res >2560 on rk3399 | expand

Commit Message

Konstantin Shabanov April 17, 2025, 4:20 a.m. UTC 
As it isn't supported by hardware. At least, RK3399 doesn't support
it. From the datasheet[1]
("1.2.10 Video IN/OUT", "Display Interface", p. 17):

  Support AFBC function co-operation with GPU
    * support 2560x1600 UI

Manually tested on RockPro64 (rk3399):
- ARM_AFBC modifier is used for 1920x1080
- DRM_FORMAT_MOD_LINEAR modifier us used for 3840x2160
- No noise on the screen when sway is running in 4k
- Dynamic resolution switching works correctly in sway

Signed-off-by: Konstantin Shabanov <mail@etehtsea.me>
Cc: Daniel Stone <daniel@fooishbar.org>
Cc: Andy Yan <andyshrk@163.com>
Reported-by: Dan Callaghan <djc@djc.id.au>
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/7968

[1]: https://opensource.rock-chips.com/images/d/d7/Rockchip_RK3399_Datasheet_V2.1-20200323.pdf
---
V2 -> V3: Run check only on rk3399
V1 -> V2: Move the check to the fb_create callback

Hi Andy and Daniel!
Thank you for the review!

Best wishes,
Konstantin

 drivers/gpu/drm/rockchip/rockchip_drm_fb.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)


base-commit: 4890d68db651562ea80250f2c93205a5c0327a6a
--
2.48.1
diff mbox series

Patch

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
index dcc1f07632c3..6ca757f80a30 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
@@ -5,6 +5,7 @@ 
  */

 #include <linux/kernel.h>
+#include <linux/of.h>

 #include <drm/drm.h>
 #include <drm/drm_atomic.h>
@@ -17,6 +18,9 @@ 
 #include "rockchip_drm_drv.h"
 #include "rockchip_drm_fb.h"
 #include "rockchip_drm_gem.h"
+#include "rockchip_drm_vop.h"
+
+#define RK3399_AFBC_MAX_WIDTH		2560

 static const struct drm_framebuffer_funcs rockchip_drm_fb_funcs = {
 	.destroy       = drm_gem_fb_destroy,
@@ -52,6 +56,15 @@  rockchip_fb_create(struct drm_device *dev, struct drm_file *file,
 	}

 	if (drm_is_afbc(mode_cmd->modifier[0])) {
+		if (of_machine_is_compatible("rockchip,rk3399")) {
+			if (mode_cmd->width > RK3399_AFBC_MAX_WIDTH) {
+				DRM_DEBUG_KMS("AFBC is not supported for the width %d (max %d)\n",
+					      mode_cmd->width,
+					      RK3399_AFBC_MAX_WIDTH);
+				return ERR_PTR(-EINVAL);
+			};
+		}
+
 		int ret, i;

 		ret = drm_gem_fb_afbc_init(dev, mode_cmd, afbc_fb);