Sean, On 08/09/2016 03:29 AM, Sean Paul wrote: > From: Douglas Anderson <dianders at chromium.org> > > When fixing up the clock in vop_crtc_mode_fixup() we're not doing it > quite correctly. Specifically if we've got the true clock 266666667 Hz, > we'll perform this calculation: > 266666667 / 1000 => 266666 > > Later when we try to set the clock we'll do clk_set_rate(266666 * > 1000). The common clock framework won't actually pick the proper clock > in this case since it always wants clocks <= the specified one. > > Let's solve this by using DIV_ROUND_UP. > > Signed-off-by: Douglas Anderson <dianders at chromium.org> > Signed-off-by: Sean Paul <seanpaul at chromium.org> After discuss with Zheng Xing (Rockchip clock contributor), we think this patch looks good, so: Reviewed-by: Yakir Yang <ykk at rock-chips.com> > --- > drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c > index 31744fe..1bbffaf 100644 > --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c > +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c > @@ -891,7 +891,8 @@ static bool vop_crtc_mode_fixup(struct drm_crtc *crtc, > struct vop *vop = to_vop(crtc); > > adjusted_mode->clock = > - clk_round_rate(vop->dclk, mode->clock * 1000) / 1000; > + DIV_ROUND_UP(clk_round_rate(vop->dclk, mode->clock * 1000), > + 1000); > > return true; > }
