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From: Douglas Anderson <dianders@chromium.org>
To: Sandy Huang <hjc@rock-chips.com>, heiko@sntech.de, seanpaul@chromium.org
Cc: linux-rockchip@lists.infradead.org, urjaman@gmail.com,
	Douglas Anderson <dianders@chromium.org>,
	Yakir Yang <ykk@rock-chips.com>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	David Airlie <airlied@linux.ie>,
	linux-arm-kernel@lists.infradead.org,
	Daniel Vetter <daniel@ffwll.ch>
Subject: [PATCH 1/2] drm/rockchip: Properly adjust to a true clock in adjusted_mode
Date: Fri, 14 Jun 2019 15:47:29 -0700
Message-ID: <20190614224730.98622-1-dianders@chromium.org> (raw)

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>
---
Back in 2016 Mark Yao said he applied this to his drm fixes [1], but it's
2019 and it's still missing so I'm posting again.

[1] https://patchwork.freedesktop.org/patch/103872/

 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 e4580d8f21e1..d124f34ab9fc 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -1006,7 +1006,8 @@ 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;
 }
-- 
2.22.0.410.gd8fdbe21b5-goog


             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14 22:47 Douglas Anderson [this message]
2019-06-14 22:47 ` [PATCH 2/2] drm/rockchip: Base adjustments of the mode based on prev adjustments Douglas Anderson
2019-06-16 13:41 ` [PATCH 1/2] drm/rockchip: Properly adjust to a true clock in adjusted_mode Heiko Stübner

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