drm/vc4: hvs: Fix dlist debug not resetting the next entry pointer

[ Upstream commit 6d5f76e ]

The debug function to display the dlists didn't reset next_entry_start
when starting each display, so resulting in not stopping the
list at the correct place.

Fixes: c6dac00 ("drm/vc4: hvs: Add debugfs node that dumps the current display lists")
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240621152055.4180873-18-dave.stevenson@raspberrypi.com
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: 6by9

drivers/gpu/drm/vc4/vc4_hvs.c

@@ -110,7 +110,7 @@ static int vc4_hvs_debugfs_dlist(struct seq_file *m, void *data)
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 	struct vc4_hvs *hvs = vc4->hvs;
 	struct drm_printer p = drm_seq_file_printer(m);
-	unsigned int next_entry_start = 0;
+	unsigned int next_entry_start;
 	unsigned int i, j;
 	u32 dlist_word, dispstat;
 
@@ -124,6 +124,7 @@ static int vc4_hvs_debugfs_dlist(struct seq_file *m, void *data)
 		}
 
 		drm_printf(&p, "HVS chan %u:\n", i);
+		next_entry_start = 0;
 
 		for (j = HVS_READ(SCALER_DISPLISTX(i)); j < 256; j++) {
 			dlist_word = readl((u32 __iomem *)vc4->hvs->dlist + j);