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package/sunxi-mali-mainline-driver: update help section to make it work on Linux >= 4.20

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On Linux version >= 4.20 in order to have mali working we need to pass
drm_kms_helper.drm_leak_fbdev_smem=1 and at least
drm_kms_helper.drm_fbdev_overalloc=200 to have a double buffer fbdev.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Giulio Benetti 2021-10-15 10:16:01 +02:00 committed by Thomas Petazzoni
parent c729278df9
commit 97408545ad
1 changed files with 10 additions and 0 deletions
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10
package/sunxi-mali-mainline-driver/Config.in
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@ -26,4 +26,14 @@ config BR2_PACKAGE_SUNXI_MALI_MAINLINE_DRIVER
enabled:
- CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM
The following kernel command line options must be passed:
- drm_kms_helper.drm_leak_fbdev_smem = 1
since drm_kms_helper.drm_leak_fbdev_smem is set to 0 by
default
- drm_kms_helper.drm_fbdev_overalloc >= 200
since the driver requires at least double buffering and
fails to work with the default value(100).
https://github.com/mripard/sunxi-mali/blob/master/README.md