[PATCH v3 12/25] drm/sun4i: sun6i_mipi_dsi: Add DSI hblk packet overhead
From: jagan@amarulasolutions.com (Jagan Teki)
Date: 2018-10-26 14:45:22
Also in:
dri-devel, linux-clk, linux-devicetree, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, drm drivers for allwinner a10, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Chen-Yu Tsai, Linus Torvalds
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
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2.18.0.321.gffc6fa0e3