diff options
| author |   Icenowy Zheng <icenowy@aosc.io> | 2019-10-07 00:03:01 +0800 |
|---|---|---|
| committer |   Maxime Ripard <mripard@kernel.org> | 2019-10-07 14:01:25 +0200 |
| commit | 81fafb9488a1d1347b39ad456d85e29649383749 (patch) | |
| tree | 916b2a25b54e49aba40e039543e156e53e28d3b6 /drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | |
| parent | cec: add cec_adapter to cec_notifier_cec_adap_unregister() (diff) | |
| download | linux-dev-81fafb9488a1d1347b39ad456d85e29649383749.tar.xz linux-dev-81fafb9488a1d1347b39ad456d85e29649383749.zip | |
drm/sun4i: dsi: fix the overhead of the horizontal front porch
The formula in the BSP kernel indicates that a 16-byte overhead is used
when sending the HFP. However, this value is currently set to 6 in the
sun6i_mipi_dsi driver, which makes some panels flashing.
Fix this overhead value.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191006160303.24413-3-icenowy@aosc.io
Diffstat (limited to 'drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c')
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index 082d196e43da..5acdddfbcb25 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -569,11 +569,12 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi, (mode->htotal - mode->hsync_end) * Bpp - HBP_PACKET_OVERHEAD); /* - * The frontporch is set using a blanking packet (4 - * bytes + payload + 2 bytes). Its minimal size is - * therefore 6 bytes + * The frontporch is set using a sync event (4 bytes) + * and two blanking packets (each one is 4 bytes + + * payload + 2 bytes). Its minimal size is therefore + * 16 bytes */ -#define HFP_PACKET_OVERHEAD 6 +#define HFP_PACKET_OVERHEAD 16 hfp = max((unsigned int)HFP_PACKET_OVERHEAD, (mode->hsync_start - mode->hdisplay) * Bpp - HFP_PACKET_OVERHEAD); |