Use the same calculation as the vendor kernel to derive the escape clock
speed.

Signed-off-by: John Keeping <j...@metanate.com>
---
 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c 
b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 7b4f4f150a0d..e621b66b9617 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -711,11 +711,13 @@ static void dw_mipi_dsi_disable(struct dw_mipi_dsi *dsi)
 
 static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
 {
+       u32 esc_clk_division = (dsi->lane_mbps >> 3) / 20 + 1;
+
        dsi_write(dsi, DSI_PWR_UP, RESET);
        dsi_write(dsi, DSI_PHY_RSTZ, PHY_DISFORCEPLL | PHY_DISABLECLK
                  | PHY_RSTZ | PHY_SHUTDOWNZ);
        dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVIDSION(10) |
-                 TX_ESC_CLK_DIVIDSION(7));
+                 TX_ESC_CLK_DIVIDSION(esc_clk_division));
 }
 
 static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi)
-- 
2.10.0.278.g4f427b1.dirty

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