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Subject[PATCH] drm/panel: simple: Doxygenize 'struct panel_desc'; rename a few functions
This attempts to address outstanding review feedback from commit
b8a2948fa2b3 ("drm/panel: simple: Add ability to override typical
timing"). Specifically:

* It was requested that I document (in the structure definition) that
the device tree override had no effect if 'struct drm_display_mode'
was used in the panel description. I have provided full Doxygen
comments for 'struct panel_desc' to accomplish that.
* panel_simple_get_fixed_modes() was thought to be a confusing name,
so it has been renamed to panel_simple_get_display_modes().
* panel_simple_parse_override_mode() was thought to be better named as

Suggested-by: Sam Ravnborg <>
Signed-off-by: Douglas Anderson <>
- I have not addressed the suggestion of doing 'bool has_override =
panel->override_mode.type != 0;'. As per my reply on the mailing
list I think the convention in this file is to rely on implicit
conversions from int to bool.
- Sam said that there was still something that he didn't understand
with regards to the flags. Sam: if this is something that needs to
be addressed, please yell.

drivers/gpu/drm/panel/panel-simple.c | 28 ++++++++++++++++++++++------
1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index a50871c6836b..f3c0e203f40f 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -38,6 +38,22 @@
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>

+ * @modes: Pointer to array of fixed modes appropriate for this panel. If
+ * only one mode then this can just be the address of this the mode.
+ * NOTE: cannot be used with "timings" and also if this is specified
+ * then you cannot override the mode in the device tree.
+ * @num_modes: Number of elements in modes array.
+ * @timings: Pointer to array of display timings. NOTE: cannot be used with
+ * "modes" and also these will be used to validate a device tree
+ * override if one is present.
+ * @num_timings: Number of elements in timings array.
+ * @bpc: Bits per color.
+ * @size: Structure containing the physical size of this panel.
+ * @delay: Structure containing various delay values for this panel.
+ * @bus_format: See MEDIA_BUS_FMT_... defines.
+ * @bus_flags: See DRM_BUS_FLAG_... defines.
+ */
struct panel_desc {
const struct drm_display_mode *modes;
unsigned int num_modes;
@@ -135,7 +151,7 @@ static unsigned int panel_simple_get_timings_modes(struct panel_simple *panel)
return num;

-static unsigned int panel_simple_get_fixed_modes(struct panel_simple *panel)
+static unsigned int panel_simple_get_display_modes(struct panel_simple *panel)
struct drm_connector *connector = panel->base.connector;
struct drm_device *drm = panel->base.drm;
@@ -199,7 +215,7 @@ static int panel_simple_get_non_edid_modes(struct panel_simple *panel)
WARN_ON(panel->desc->num_timings && panel->desc->num_modes);
if (num == 0)
- num = panel_simple_get_fixed_modes(panel);
+ num = panel_simple_get_display_modes(panel);

connector->display_info.bpc = panel->desc->bpc;
connector->display_info.width_mm = panel->desc->size.width;
@@ -351,9 +367,9 @@ static const struct drm_panel_funcs panel_simple_funcs = {
#define PANEL_SIMPLE_BOUNDS_CHECK(to_check, bounds, field) \
(to_check->field.typ >= bounds->field.min && \
to_check->field.typ <= bounds->field.max)
-static void panel_simple_parse_override_mode(struct device *dev,
- struct panel_simple *panel,
- const struct display_timing *ot)
+static void panel_simple_parse_panel_timing_node(struct device *dev,
+ struct panel_simple *panel,
+ const struct display_timing *ot)
const struct panel_desc *desc = panel->desc;
struct videomode vm;
@@ -446,7 +462,7 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)

if (!of_get_display_timing(dev->of_node, "panel-timing", &dt))
- panel_simple_parse_override_mode(dev, panel, &dt);
+ panel_simple_parse_panel_timing_node(dev, panel, &dt);

panel-> = dev;
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