linux-kernel - [PATCH v6 1/6] drm/rockchip: return a true clock rate to adjusted

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Message-Id: <1450260616-21160-2-git-send-email-zyw@rock-chips.com>
Date:	Wed, 16 Dec 2015 18:10:11 +0800
From:	Chris Zhong <zyw@...k-chips.com>
To:	heiko@...ech.de, linux-rockchip@...ts.infradead.org,
	mark.yao@...k-chips.com, treding@...dia.com
Cc:	Chris Zhong <zyw@...k-chips.com>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v6 1/6] drm/rockchip: return a true clock rate to adjusted_mode

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@...k-chips.com>
Acked-by: Mark Yao <mark.yao@...k-chips.com>

---

Changes in v6: None
Changes in v5: None
Changes in v4:
- use clk_round_rate to check the clock rate in vop_crtc_mode_fixup

Changes in v3: 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 696e977..d9ec780 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -1146,9 +1146,14 @@ 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;
 }
 
-- 
2.6.3

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