[PATCH] drm/loongson: stop to set get_vblank_timestamp for 7A1000 CRTC

[Icenowy Zheng <zhengxingda@iscas.ac.cn>]

As there's no known hardware capability about querying vblank on the
7A1000 display controller, setting get_vblank_timestamp will mislead the
kernel about the support of DC-backed high precision vblank query.

Drop this function pointer in the CRTC function table for 7A1000.

This solves a kernel warning when booting Linux 7.0-rc3 on a
3A4000+7A1000 Haier Boyue G51 laptop (with injected EDID for replicating
the display timing set by the firmware).

Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
---
 drivers/gpu/drm/loongson/lsdc_crtc.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/gpu/drm/loongson/lsdc_crtc.c b/drivers/gpu/drm/loongson/lsdc_crtc.c
index 587fbe285e9ef..b3af8e0cdb15f 100644
--- a/drivers/gpu/drm/loongson/lsdc_crtc.c
+++ b/drivers/gpu/drm/loongson/lsdc_crtc.c
@@ -721,7 +721,6 @@ static const struct drm_crtc_funcs ls7a1000_crtc_funcs = {
 	.late_register = lsdc_crtc_late_register,
 	.enable_vblank = lsdc_crtc_enable_vblank,
 	.disable_vblank = lsdc_crtc_disable_vblank,
-	.get_vblank_timestamp = drm_crtc_vblank_helper_get_vblank_timestamp,
 	.atomic_print_state = lsdc_crtc_atomic_print_state,
 };
 
-- 
2.52.0