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drm/rockchip: return a true clock rate to adjusted_mode

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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 <zyw@rock-chips.com>
Acked-by: Mark Yao <mark.yao@rock-chips.com>
This commit is contained in:
Chris Zhong 2016-01-06 12:03:53 +08:00 committed by Mark Yao
parent c11b898963
commit b59b8de314
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/rockchip/rockchip_drm_vop.c
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@ -878,9 +878,14 @@ 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;
}