[PATCH 18/22] video: Rockchip: fix zero division in rk3588_calc_cru_cfg

[Ahmad Fatoum]

This was detected by clang-analyzer and I don't understand how that
function could have ever worked, because it's running into the zero
division in the "successful" code path.

Peeking at rk3568_set_intf_mux, the CRTC clock is passed by the caller
in barebox, so let's do the same for rk3588_calc_cru_cfg.

Fixes: c8c0833beb77 ("video: Rockchip: Add VOP2 driver")
Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 drivers/video/rockchip/rockchip_drm_vop2.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/video/rockchip/rockchip_drm_vop2.c b/drivers/video/rockchip/rockchip_drm_vop2.c
index 3a1c951ec7e4..f15ef1b57bf5 100644
--- a/drivers/video/rockchip/rockchip_drm_vop2.c
+++ b/drivers/video/rockchip/rockchip_drm_vop2.c
@@ -743,10 +743,10 @@ static unsigned long rk3588_calc_dclk(unsigned long child_clk, unsigned long max
  */
 static unsigned long rk3588_calc_cru_cfg(struct vop2_video_port *vp, int id,
 					 int *dclk_core_div, int *dclk_out_div,
-					 int *if_pixclk_div, int *if_dclk_div)
+					 int *if_pixclk_div, int *if_dclk_div,
+					 u32 crtc_clock)
 {
 	struct vop2 *vop2 = vp->vop2;
-	u32 crtc_clock = 0;
 	unsigned long v_pixclk = crtc_clock * 1000LL; /* video timing pixclk */
 	unsigned long dclk_core_rate = v_pixclk >> 2;
 	unsigned long dclk_rate = v_pixclk;
@@ -856,7 +856,7 @@ static unsigned long rk3588_set_intf_mux(struct vop2_video_port *vp, int id, u32
 	u32 die, dip, div, vp_clk_div, val;
 
 	clock = rk3588_calc_cru_cfg(vp, id, &dclk_core_div, &dclk_out_div,
-				    &if_pixclk_div, &if_dclk_div);
+				    &if_pixclk_div, &if_dclk_div, clock);
 	if (!clock)
 		return 0;
 
-- 
2.39.5