[PATCH v10 09/13] drm/mediatek: add mipi_tx data rate check

[YT Shen]

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

Signed-off-by: shaoming chen <shaoming.chen at mediatek.com>
Signed-off-by: YT Shen <yt.shen at mediatek.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