Since the mipi dsi driver need to use the clock of vop to make the
calculation of Blanking. But sometimes the clock driver can not set a
accurate clock_rate for vop, get it by clk_round_rate before mode_set,
so we can get the true value.

Signed-off-by: Chris Zhong <redacted>

---

Changes in v4:
use clk_round_rate to check the clock rate in vop_crtc_mode_fixup

Changes in v3: None
Changes in v2: None

  drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 5d8ae5e..eff545b 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c

@@ -1136,9 +1136,14 @@ static bool vop_crtc_mode_fixup(struct drm_crtc *crtc,
  				const struct drm_display_mode *mode,
  				struct drm_display_mode *adjusted_mode)
  {
+	struct vop *vop = to_vop(crtc);
+
  	if (adjusted_mode->htotal == 0 || adjusted_mode->vtotal == 0)
  		return false;
  
+	adjusted_mode->clock =
+		clk_round_rate(vop->dclk, mode->clock * 1000) / 1000;
+
  	return true;
  }