From: Douglas Anderson dianders@chromium.org
[ Upstream commit 99b9683f2142b20bad78e61f7f829e8714e45685 ]
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.
Fixes: b59b8de31497 ("drm/rockchip: return a true clock rate to adjusted_mode") Signed-off-by: Douglas Anderson dianders@chromium.org Signed-off-by: Sean Paul seanpaul@chromium.org Reviewed-by: Yakir Yang ykk@rock-chips.com Signed-off-by: Heiko Stuebner heiko@sntech.de Link: https://patchwork.freedesktop.org/patch/msgid/20190614224730.98622-1-diander... Signed-off-by: Sasha Levin sashal@kernel.org --- 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 cd58dc81ccf3..d1bf8c06aa34 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -1019,7 +1019,8 @@ 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; }