Burst mode display timings are different from conventional video mode.
For burst mode most of the timings hsa, hbp, hfp, vblk are 0 and hblk is computed as (mode->hdisplay * Bpp)
This patch simply add burst mode timings without touching existing mode timings.
Reference code taken from BSP (from linux-sunxi/ drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c)
dsi_hsa = 0; dsi_hbp = 0; dsi_hact = x*dsi_pixel_bits[format]/8; dsi_hblk = dsi_hact; dsi_hfp = 0; dsi_vblk = 0;
Signed-off-by: Jagan Teki jagan@amarulasolutions.com Tested-by: Merlijn Wajer merlijn@wizzup.org --- drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index 813d5523f1c7..0f02bcc997a5 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -477,6 +477,12 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
/* Do all timing calculations up front to allocate buffer space */
+ if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) { + hbp = hfp = hsa = vblk = 0; + hblk = (mode->hdisplay * Bpp); + goto alloc_buf; + } + /* * A sync period is composed of a blanking packet (4 bytes + * payload + 2 bytes) and a sync event packet (4 bytes). Its @@ -515,6 +521,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi, */ vblk = 0;
+alloc_buf: /* How many bytes do we need to send all payloads? */ bytes = max_t(size_t, max(max(hfp, hblk), max(hsa, hbp)), vblk); buffer = kmalloc(bytes, GFP_KERNEL);