1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 48af5cac1902..240c331405b9 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -568,11 +568,11 @@ static irqreturn_t tda998x_irq_thread(int irq, void *data)
 
 static uint8_t tda998x_cksum(uint8_t *buf, size_t bytes)
 {
-        uint8_t sum = 0;
+        int sum = 0;
 
         while (bytes--)
-                sum += *buf++;
-        return (255 - sum) + 1;
+                sum -= *buf++;
+        return sum;
 }
 
 #define HB(x) (x)