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Subject[PATCH v3 12/25] drm/sun4i: sun6i_mipi_dsi: Add DSI hblk packet overhead
Date
Add 10 bytes packet overhead for hblk where blank is set using
a blanking packet like (4 bytes + 4 bytes + payload + 2 bytes)

This is according to BSP code from BPI-M64-bsp
(in drivers/video/sunxi/disp2/disp/de/lowlevel_sun50iw1/de_dsi.c)
dsi_hblk = (ht-hspw)*dsi_pixel_bits[format]/8-(4+4+2);

So, add 10 bytes packet overhead for DSI hblk.

Tested on 2-lane, 4-lane MIPI-DSI LCD panels.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
---
Changes for v3:
- new patch
Changes for v2:
- none

drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 596e560263bf..cf42be1f1ba1 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -461,7 +461,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
{
struct mipi_dsi_device *device = dsi->device;
unsigned int Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
- u16 hbp, hfp, hsa, hblk, vblk;
+ u16 hbp, hfp, hsa, hblk_max, hblk, vblk;
size_t bytes;
u8 *buffer;

@@ -494,8 +494,13 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,

/*
* hblk seems to be the line + porches length.
+ * The blank is set using a blanking packet (4 bytes + 4 bytes +
+ * payload + 2 bytes). So minimal size is 10 bytes
*/
- hblk = (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp;
+#define HBLK_PACKET_OVERHEAD 10
+ hblk_max = (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp;
+ hblk_max -= HBLK_PACKET_OVERHEAD;
+ hblk = max((unsigned int)HBLK_PACKET_OVERHEAD, hblk_max);

/*
* And I'm not entirely sure what vblk is about. The driver in
--
2.18.0.321.gffc6fa0e3
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