We expected to end with "timeout_ms" set to zero, but it's a post-op so
the current code ends with -1. Let's fix this by changing it to a
pre-op.
Fixes: 21898816831f ("drm/mediatek: add dsi transfer function")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 808b995a990f..3a0b6d1057a2 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -902,7 +902,7 @@ static void mtk_dsi_wait_for_idle(struct mtk_dsi *dsi)
{
u32 timeout_ms = 500000; /* total 1s ~ 2s timeout */
- while (timeout_ms--) {
+ while (--timeout_ms) {
if (!(readl(dsi->regs + DSI_INTSTA) & DSI_BUSY))
break;
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