[PATCH 1/3] drm/rockchip: vop2: Use drm_format_info_min_pitch() for plane offsets

[Chaoyi Chen <kernel@airkyi.com>]

From: Chaoyi Chen <chaoyi.chen@rock-chips.com>

Use the block aware helper instead of cpp[], the latter aliases
char_per_block and is wrong for packed 10-bit formats like NV15,
NV20 and NV30.

Tested with modetest[0]:

```
	modetest -s 86:3840x2160 -P \
	59@83:3940x2160~96,0,3840,2160+0+0@NV20 -a
```

fb size (3940x2160), src at (96, 0) with size (3840x2160),
dst at (0, 0) with size (3840x2160)

[0]: https://github.com/windowsair/libdrm/tree/src-pos-support

Assisted-by: LLM
Signed-off-by: Chaoyi Chen <chaoyi.chen@rock-chips.com>
---
 drivers/gpu/drm/rockchip/rockchip_drm_vop2.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
index 4cce3e336f5b..480aa8c8a8d2 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c
@@ -1290,7 +1290,7 @@ static void vop2_plane_atomic_update(struct drm_plane *plane,
 
 	afbc_en = drm_is_afbc(fb->modifier);
 
-	offset = (src->x1 >> 16) * fb->format->cpp[0];
+	offset = drm_format_info_min_pitch(fb->format, 0, src->x1 >> 16);
 
 	/*
 	 * AFBC HDR_PTR must set to the zero offset of the framebuffer.
@@ -1309,6 +1309,7 @@ static void vop2_plane_atomic_update(struct drm_plane *plane,
 		int hsub = fb->format->hsub;
 		int vsub = fb->format->vsub;
 
+		offset = drm_format_info_min_pitch(fb->format, 1, src->x1 >> 16) / hsub;
 		offset = (src->x1 >> 16) * fb->format->cpp[1] / hsub;
 		offset += (src->y1 >> 16) * fb->pitches[1] / vsub;
 
-- 
2.53.0