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drm/panel: simple: Add display timing support

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The simple panel driver's ->get_modes() implementation calculates the
display mode list from the typical timings and the ->get_timings()
implementation returns the timings to the connected encoder for mode
validation and fixup.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
[treding@nvidia.com: select VIDEOMODE_HELPERS]
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Philipp Zabel 2014-12-11 18:32:45 +01:00 committed by Thierry Reding
parent 2938931f37
commit a5d3e62514
2 changed files with 43 additions and 0 deletions
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1
drivers/gpu/drm/panel/Kconfig
View File

@ -11,6 +11,7 @@ config DRM_PANEL_SIMPLE
tristate "support for simple panels"
depends on OF
depends on BACKLIGHT_CLASS_DEVICE
select VIDEOMODE_HELPERS
help
DRM panel driver for dumb panels that need at most a regulator and
a GPIO to be powered up. Optionally a backlight can be attached so

42
drivers/gpu/drm/panel/panel-simple.c
View File

@ -33,9 +33,14 @@
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>
#include <video/display_timing.h>
#include <video/videomode.h>
struct panel_desc {
const struct drm_display_mode *modes;
unsigned int num_modes;
const struct display_timing *timings;
unsigned int num_timings;
unsigned int bpc;
@ -94,6 +99,25 @@ static int panel_simple_get_fixed_modes(struct panel_simple *panel)
if (!panel->desc)
return 0;
for (i = 0; i < panel->desc->num_timings; i++) {
const struct display_timing *dt = &panel->desc->timings[i];
struct videomode vm;
videomode_from_timing(dt, &vm);
mode = drm_mode_create(drm);
if (!mode) {
dev_err(drm->dev, "failed to add mode %ux%u\n",
dt->hactive.typ, dt->vactive.typ);
continue;
}
drm_display_mode_from_videomode(&vm, mode);
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
num++;
}
for (i = 0; i < panel->desc->num_modes; i++) {
const struct drm_display_mode *m = &panel->desc->modes[i];
@ -226,12 +250,30 @@ static int panel_simple_get_modes(struct drm_panel *panel)
return num;
}
static int panel_simple_get_timings(struct drm_panel *panel,
unsigned int num_timings,
struct display_timing *timings)
{
struct panel_simple *p = to_panel_simple(panel);
unsigned int i;
if (p->desc->num_timings < num_timings)
num_timings = p->desc->num_timings;
if (timings)
for (i = 0; i < num_timings; i++)
timings[i] = p->desc->timings[i];
return p->desc->num_timings;
}
static const struct drm_panel_funcs panel_simple_funcs = {
.disable = panel_simple_disable,
.unprepare = panel_simple_unprepare,
.prepare = panel_simple_prepare,
.enable = panel_simple_enable,
.get_modes = panel_simple_get_modes,
.get_timings = panel_simple_get_timings,
};
static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)