From 1185c406f11a49335253036feaa0169c0d174ef8 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Tue, 30 Jun 2020 02:33:20 +0300 Subject: [PATCH] drm: panel: simple: Warn in case of incorrect bus format for LVDS panels Only the MEDIA_BUS_FMT_RGB666_1X7X3_SPWG, MEDIA_BUS_FMT_RGB888_1X7X4_SPWG and MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA bus formats are valid for LVDS panels. Warn at probe time to catch the common mistake of using an incorrect format, as well as discrepancies between the bus format and the reported bpc. Signed-off-by: Laurent Pinchart Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20200629233320.8774-5-laurent.pinchart+renesas@ideasonboard.com --- drivers/gpu/drm/panel/panel-simple.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index cd41637..3a35f74 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -549,13 +549,22 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc) panel_simple_parse_panel_timing_node(dev, panel, &dt); } - if (desc->connector_type == DRM_MODE_CONNECTOR_LVDS) + if (desc->connector_type == DRM_MODE_CONNECTOR_LVDS) { /* Catch common mistakes for LVDS panels. */ WARN_ON(desc->bus_flags & ~(DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_DATA_MSB_TO_LSB | DRM_BUS_FLAG_DATA_LSB_TO_MSB)); + WARN_ON(desc->bus_format != MEDIA_BUS_FMT_RGB666_1X7X3_SPWG && + desc->bus_format != MEDIA_BUS_FMT_RGB888_1X7X4_SPWG && + desc->bus_format != MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA); + WARN_ON(desc->bus_format == MEDIA_BUS_FMT_RGB666_1X7X3_SPWG && + desc->bpc != 6); + WARN_ON((desc->bus_format == MEDIA_BUS_FMT_RGB888_1X7X4_SPWG || + desc->bus_format == MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA) && + desc->bpc != 8); + } drm_panel_init(&panel->base, dev, &panel_simple_funcs, desc->connector_type); -- 2.7.4