[PATCH v6 03/22] drm/sun4i: sun6i_mipi_dsi: Setup burst mode timings

Jagan Teki
2019-01-24T19:59:41Z

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 add burst mode timings and directly goto alloc buffer.

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>
---
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);
--
2.18.0.321.gffc6fa0e3