Re: [PATCH v2 14/26] drm/rockchip: dw-mipi-dsi: fix escape clock rate

From: Chris Zhong
Date: Sun Jan 22 2017 - 04:38:02 EST


Reviewed-by: Chris Zhong <zyw@xxxxxxxxxxxxxx>

On 01/22/2017 12:31 AM, John Keeping wrote:
Use the same calculation as the vendor kernel to derive the escape clock
speed.

Signed-off-by: John Keeping <john@xxxxxxxxxxxx>
---
Unchanged in v2
---
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 290282e86d16..c2e0ba96e0a0 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -710,11 +710,13 @@ 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,