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| author | Paul Cercueil <paul@crapouillou.net> | 2020-11-19 15:55:58 +0000 |
|---|---|---|
| committer | Paul Cercueil <paul@crapouillou.net> | 2020-12-08 13:55:56 +0000 |
| commit | 28ab7d35b6e0796dd7a9a382473e2b41a68ff906 (patch) | |
| tree | 9ad6621d5debaccba9e330d3745554a49f417a07 /drivers/gpu/drm/ingenic | |
| parent | 15b7e07bcb2ef3101dfe8413eb67005dadb2f90f (diff) | |
| download | lwn-28ab7d35b6e0796dd7a9a382473e2b41a68ff906.tar.gz lwn-28ab7d35b6e0796dd7a9a382473e2b41a68ff906.zip | |
drm/ingenic: Properly compute timings when using a 3x8-bit panel
The LCD controller expects timing values in dot-clock ticks, which is 3x
the timing values in pixels when using a 3x8-bit display; but it will
count the display area size in pixels either way. Go figure.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20201119155559.14112-3-paul@crapouillou.net
Diffstat (limited to 'drivers/gpu/drm/ingenic')
| -rw-r--r-- | drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c index 6b668cec6dbc..27512f68217e 100644 --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c @@ -644,6 +644,7 @@ static int ingenic_drm_encoder_atomic_check(struct drm_encoder *encoder, struct drm_connector_state *conn_state) { struct drm_display_info *info = &conn_state->connector->display_info; + struct drm_display_mode *mode = &crtc_state->adjusted_mode; if (info->num_bus_formats != 1) return -EINVAL; @@ -652,10 +653,22 @@ static int ingenic_drm_encoder_atomic_check(struct drm_encoder *encoder, return 0; switch (*info->bus_formats) { + case MEDIA_BUS_FMT_RGB888_3X8: + /* + * The LCD controller expects timing values in dot-clock ticks, + * which is 3x the timing values in pixels when using a 3x8-bit + * display; but it will count the display area size in pixels + * either way. Go figure. + */ + mode->crtc_clock = mode->clock * 3; + mode->crtc_hsync_start = mode->hsync_start * 3 - mode->hdisplay * 2; + mode->crtc_hsync_end = mode->hsync_end * 3 - mode->hdisplay * 2; + mode->crtc_hdisplay = mode->hdisplay; + mode->crtc_htotal = mode->htotal * 3 - mode->hdisplay * 2; + return 0; case MEDIA_BUS_FMT_RGB565_1X16: case MEDIA_BUS_FMT_RGB666_1X18: case MEDIA_BUS_FMT_RGB888_1X24: - case MEDIA_BUS_FMT_RGB888_3X8: return 0; default: return -EINVAL; |