linux-kernel - [PATCH v10 09/13] drm/mediatek: add mipi

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Date:   Fri, 25 Nov 2016 18:34:32 +0800
From:   YT Shen <yt.shen@...iatek.com>
To:     <dri-devel@...ts.freedesktop.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC:     David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        YT Shen <yt.shen@...iatek.com>,
        Daniel Kurtz <djkurtz@...omium.org>,
        Mao Huang <littlecvr@...omium.org>, CK Hu <ck.hu@...iatek.com>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Jie Qiu <jie.qiu@...iatek.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        shaoming chen <shaoming.chen@...iatek.com>,
        Jitao Shi <jitao.shi@...iatek.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <srv_heupstream@...iatek.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        <yingjoe.chen@...iatek.com>, <emil.l.velikov@...il.com>
Subject: [PATCH v10 09/13] drm/mediatek: add mipi_tx data rate check

modify data rate limitation (>lGbps/lane) for mipitx

Signed-off-by: shaoming chen <shaoming.chen@...iatek.com>
Signed-off-by: YT Shen <yt.shen@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_mipi_tx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
index fd84914..1ef00ac 100644
--- a/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
+++ b/drivers/gpu/drm/mediatek/mtk_mipi_tx.c
@@ -177,7 +177,9 @@ static int mtk_mipi_tx_pll_prepare(struct clk_hw *hw)
 
 	dev_dbg(mipi_tx->dev, "prepare: %u Hz\n", mipi_tx->data_rate);
 
-	if (mipi_tx->data_rate >= 500000000) {
+	if (mipi_tx->data_rate > 1250000000) {
+		return -EINVAL;
+	} else if (mipi_tx->data_rate >= 500000000) {
 		txdiv = 1;
 		txdiv0 = 0;
 		txdiv1 = 0;
-- 
1.9.1