linux-kernel - [PATCH 7/7] drm/rockchip: dw-mipi: fix insufficient bandwidth of some panel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1467968701-15620-8-git-send-email-zyw@rock-chips.com>
Date:	Fri,  8 Jul 2016 17:05:01 +0800
From:	Chris Zhong <zyw@...k-chips.com>
To:	dianders@...omium.org, tfiga@...omium.org, heiko@...ech.de,
	yzq@...k-chips.com
Cc:	linux-rockchip@...ts.infradead.org,
	Chris Zhong <zyw@...k-chips.com>,
	Mark Yao <mark.yao@...k-chips.com>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 7/7] drm/rockchip: dw-mipi: fix insufficient bandwidth of some panel

Set the lanes bps to 1 / 0.9 times of pclk, the margin is not enough
for some panel, it will cause the screen display is not normal, so
increases the badnwidth to 1 / 0.8.

Signed-off-by: Chris Zhong <zyw@...k-chips.com>

---

 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 8401185..fca7dde 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -503,8 +503,8 @@ static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi)
 
 	mpclk = DIV_ROUND_UP(dsi->mode->clock, MSEC_PER_SEC);
 	if (mpclk) {
-		/* take 1 / 0.9, since mbps must big than bandwidth of RGB */
-		tmp = mpclk * (bpp / dsi->lanes) * 10 / 9;
+		/* take 1 / 0.8, since mbps must big than bandwidth of RGB */
+		tmp = mpclk * (bpp / dsi->lanes) * 10 / 8;
 		if (tmp < max_mbps)
 			target_mbps = tmp;
 		else
-- 
2.6.3