[PATCH 07/12] drm/sun4i: sun6i_mipi_dsi: Fix TCON DRQ set bits

[Jagan Teki]

TCON DRQ set bits for non-burst DSI mode can computed via
horizontal front porch instead of front porch + sync timings.

Since there no documentation for TCON_DRQ_REG(0x7c) register
this change is taken as reference from BPI-M64-bsp.

Signed-off-by: Jagan Teki <ja...@amarulasolutions.com>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c 
b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 599284971ab6..9918fdb990ff 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -367,9 +367,9 @@ static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
        struct mipi_dsi_device *device = dsi->device;
        u32 val = 0;
 
-       if ((mode->hsync_end - mode->hdisplay) > 20) {
+       if ((mode->hsync_start - mode->hdisplay) > 20) {
                /* Maaaaaagic */
-               u16 drq = (mode->hsync_end - mode->hdisplay) - 20;
+               u16 drq = (mode->hsync_start - mode->hdisplay) - 20;
 
                drq *= mipi_dsi_pixel_format_to_bpp(device->format);
                drq /= 32;
-- 
2.18.0.321.gffc6fa0e3