kernel/linux.git/drivers/gpu/drm/ast, branch v6.1.168

drm/ast: dp501: Fix initialization of SCU2C

2026-04-11T12:16:27+00:00

commit 2f42c1a6161646cbd29b443459fd635d29eda634 upstream. Ast's DP501 initialization reads the register SCU2C at offset 0x1202c and tries to set it to source data from VGA. But writes the update to offset 0x0, with unknown results. Write the result to SCU instead. The bug only happens in ast_init_analog(). There's similar code in ast_init_dvo(), which works correctly. Signed-off-by: Thomas Zimmermann Fixes: 83c6620bae3f ("drm/ast: initial DP501 support (v0.2)") Reviewed-by: Jocelyn Falempe Cc: Dave Airlie Cc: Thomas Zimmermann Cc: Jocelyn Falempe Cc: dri-devel@lists.freedesktop.org Cc: # v3.16+ Link: https://patch.msgid.link/20260327133532.79696-2-tzimmermann@suse.de Signed-off-by: Greg Kroah-Hartman

drm/ast: Use msleep instead of mdelay for edid read

2025-10-02T11:40:42+00:00

[ Upstream commit c7c31f8dc54aa3c9b2c994b5f1ff7e740a654e97 ] The busy-waiting in `mdelay()` can cause CPU stalls and kernel timeouts during boot. Signed-off-by: Nirmoy Das Reviewed-by: Thomas Zimmermann Tested-by: Carol L Soto csoto@nvidia.com Fixes: 594e9c04b586 ("drm/ast: Create the driver for ASPEED proprietory Display-Port") Cc: KuoHsiang Chou Cc: Thomas Zimmermann Cc: Dave Airlie Cc: Jocelyn Falempe Cc: dri-devel@lists.freedesktop.org Cc: # v5.19+ Signed-off-by: Thomas Zimmermann Link: https://lore.kernel.org/r/20250917194346.2905522-1-nirmoyd@nvidia.com [ Applied change to ast_astdp_read_edid() instead of ast_astdp_read_edid_block() ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

drm/ast: Find VBIOS mode from regular display size

2025-06-04T12:40:17+00:00

[ Upstream commit c81202906b5cd56db403e95db3d29c9dfc8c74c1 ] The ast driver looks up supplied display modes from an internal list of display modes supported by the VBIOS. Do not use the crtc_-prefixed display values from struct drm_display_mode for looking up the VBIOS mode. The fields contain raw values that the driver programs to hardware. They are affected by display settings like double-scan or interlace. Instead use the regular vdisplay and hdisplay fields for lookup. As the programmed values can now differ from the values used for lookup, set struct drm_display_mode.crtc_vdisplay and .crtc_hdisplay from the VBIOS mode. Signed-off-by: Thomas Zimmermann Reviewed-by: Jocelyn Falempe Link: https://patchwork.freedesktop.org/patch/msgid/20250131092257.115596-9-tzimmermann@suse.de Signed-off-by: Sasha Levin

drm/ast: Fix soft lockup

2024-04-17T09:18:27+00:00

commit bc004f5038220b1891ef4107134ccae44be55109 upstream. There is a while-loop in ast_dp_set_on_off() that could lead to infinite-loop. This is because the register, VGACRI-Dx, checked in this API is a scratch register actually controlled by a MCU, named DPMCU, in BMC. These scratch registers are protected by scu-lock. If suc-lock is not off, DPMCU can not update these registers and then host will have soft lockup due to never updated status. DPMCU is used to control DP and relative registers to handshake with host's VGA driver. Even the most time-consuming task, DP's link training, is less than 100ms. 200ms should be enough. Signed-off-by: Jammy Huang Fixes: 594e9c04b586 ("drm/ast: Create the driver for ASPEED proprietory Display-Port") Reviewed-by: Jocelyn Falempe Reviewed-by: Thomas Zimmermann Signed-off-by: Thomas Zimmermann Cc: KuoHsiang Chou Cc: Thomas Zimmermann Cc: Dave Airlie Cc: Jocelyn Falempe Cc: dri-devel@lists.freedesktop.org Cc: # v5.19+ Link: https://patchwork.freedesktop.org/patch/msgid/20240403090246.1495487-1-jammy_huang@aspeedtech.com Signed-off-by: Greg Kroah-Hartman

drm/ast: Fix DRAM init on AST2200

2023-09-19T10:27:56+00:00

commit 4cfe75f0f14f044dae66ad0e6eea812d038465d9 upstream. Fix the test for the AST2200 in the DRAM initialization. The value in ast->chip has to be compared against an enum constant instead of a numerical value. This bug got introduced when the driver was first imported into the kernel. Signed-off-by: Thomas Zimmermann Fixes: 312fec1405dd ("drm: Initial KMS driver for AST (ASpeed Technologies) 2000 series (v2)") Cc: Dave Airlie Cc: dri-devel@lists.freedesktop.org Cc: # v3.5+ Reviewed-by: Sui Jingfeng Reviewed-by: Jocelyn Falempe Tested-by: Jocelyn Falempe # AST2600 Link: https://patchwork.freedesktop.org/patch/msgid/20230621130032.3568-2-tzimmermann@suse.de Signed-off-by: Greg Kroah-Hartman

drm/ast: Use drm_aperture_remove_conflicting_pci_framebuffers

2023-08-30T14:10:57+00:00

[ Upstream commit c1ebead36099deb85384f6fb262fe619a04cee73 ] It's just open coded and matches. Note that Thomas said that his version apparently failed for some reason, but hey maybe we should try again. Signed-off-by: Daniel Vetter Cc: Dave Airlie Cc: Thomas Zimmermann Cc: Javier Martinez Canillas Cc: Helge Deller Cc: linux-fbdev@vger.kernel.org Tested-by: Thomas Zimmmermann Reviewed-by: Thomas Zimmermann Signed-off-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20230111154112.90575-1-daniel.vetter@ffwll.ch Stable-dep-of: 5ae3716cfdcd ("video/aperture: Only remove sysfb on the default vga pci device") Signed-off-by: Sasha Levin

drm/ast: Fix ARM compatibility

2023-06-09T08:34:07+00:00

[ Upstream commit 4327a6137ed43a091d900b1ac833345d60f32228 ] ARM architecture only has 'memory', so all devices are accessed by MMIO if possible. Signed-off-by: Jammy Huang Reviewed-by: Thomas Zimmermann Signed-off-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20230421003354.27767-1-jammy_huang@aspeedtech.com Signed-off-by: Sasha Levin

drm/ast: make ast_modeset static

2022-09-26T07:11:47+00:00

The symbol is not used outside of the file, so mark it static. Fixes the following warning: drivers/gpu/drm/ast/ast_drv.c:42:5: warning: symbol 'ast_modeset' was not declared. Should it be static? Signed-off-by: ruanjinjie Signed-off-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20220926023253.739699-1-ruanjinjie@huawei.com

drm/ast: Fix video broken in some resolutions on ast2600

2022-09-20T08:20:23+00:00

Some cases are not handled well for ast2600. Signed-off-by: Jammy Huang Signed-off-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20220916091706.4559-1-jammy_huang@aspeedtech.com

drm/ast: Add resolution support for 1152x864@75

2022-09-20T08:19:32+00:00

Add 1152x864 into support list. Signed-off-by: Jammy Huang Signed-off-by: Thomas Zimmermann Link: https://patchwork.freedesktop.org/patch/msgid/20220916085058.3386-1-jammy_huang@aspeedtech.com