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drm/panel: simple: Add ability to override typical timing

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This patch adds the ability to override the typical display timing for a
given panel. This is useful for devices which have timing constraints
that do not apply across the entire display driver (eg: to avoid
crosstalk between panel and digitizer on certain laptops). The rules are
as follows:

- panel must not specify fixed mode (since the override mode will
  either be the same as the fixed mode, or we'll be unable to
  check the bounds of the overried)
- panel must specify at least one display_timing range which will be
  used to ensure the override mode fits within its bounds

Changes in v2:
 - Parse the full display-timings node (using the native-mode) (Rob)
Changes in v3:
 - No longer parse display-timings subnode, use panel-timing (Rob)
Changes in v4:
 - Don't add mode from timing if override was specified (Thierry)
 - Add warning if timing and fixed mode was specified (Thierry)
 - Don't add fixed mode if timing was specified (Thierry)
 - Refactor/rename a bit to avoid extra indentation from "if" tests
 - i should be unsigned (Thierry)
 - Add annoying WARN_ONs for some cases (Thierry)
 - Simplify 'No display_timing found' handling (Thierry)
 - Rename to panel_simple_parse_override_mode() (Thierry)
Changes in v5:
 - Added Heiko's Tested-by
Changes in v6:
 - Rebased to drm-misc next
 - Added tags

Cc: Doug Anderson <dianders@chromium.org>
Cc: Eric Anholt <eric@anholt.net>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Jeffy Chen <jeffy.chen@rock-chips.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Stéphane Marchesin <marcheu@chromium.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: devicetree@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190711203455.125667-2-dianders@chromium.org
This commit is contained in:
Sean Paul 2019-07-11 13:34:53 -07:00 committed by Sam Ravnborg
parent a4e7e98e90
commit b8a2948fa2
1 changed files with 104 additions and 5 deletions
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109
drivers/gpu/drm/panel/panel-simple.c
View File

@ -30,6 +30,7 @@
#include <linux/regulator/consumer.h>
#include <video/display_timing.h>
#include <video/of_display_timing.h>
#include <video/videomode.h>
#include <drm/drm_crtc.h>
@ -92,6 +93,8 @@ struct panel_simple {
struct i2c_adapter *ddc;
struct gpio_desc *enable_gpio;
struct drm_display_mode override_mode;
};
static inline struct panel_simple *to_panel_simple(struct drm_panel *panel)
@ -99,16 +102,13 @@ static inline struct panel_simple *to_panel_simple(struct drm_panel *panel)
return container_of(panel, struct panel_simple, base);
}
static int panel_simple_get_fixed_modes(struct panel_simple *panel)
static unsigned int panel_simple_get_timings_modes(struct panel_simple *panel)
{
struct drm_connector *connector = panel->base.connector;
struct drm_device *drm = panel->base.drm;
struct drm_display_mode *mode;
unsigned int i, num = 0;
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;
@ -132,6 +132,16 @@ static int panel_simple_get_fixed_modes(struct panel_simple *panel)
num++;
}
return num;
}
static unsigned int panel_simple_get_fixed_modes(struct panel_simple *panel)
{
struct drm_connector *connector = panel->base.connector;
struct drm_device *drm = panel->base.drm;
struct drm_display_mode *mode;
unsigned int i, num = 0;
for (i = 0; i < panel->desc->num_modes; i++) {
const struct drm_display_mode *m = &panel->desc->modes[i];
@ -153,6 +163,44 @@ static int panel_simple_get_fixed_modes(struct panel_simple *panel)
num++;
}
return num;
}
static int panel_simple_get_non_edid_modes(struct panel_simple *panel)
{
struct drm_connector *connector = panel->base.connector;
struct drm_device *drm = panel->base.drm;
struct drm_display_mode *mode;
bool has_override = panel->override_mode.type;
unsigned int num = 0;
if (!panel->desc)
return 0;
if (has_override) {
mode = drm_mode_duplicate(drm, &panel->override_mode);
if (mode) {
drm_mode_probed_add(connector, mode);
num = 1;
} else {
dev_err(drm->dev, "failed to add override mode\n");
}
}
/* Only add timings if override was not there or failed to validate */
if (num == 0 && panel->desc->num_timings)
num = panel_simple_get_timings_modes(panel);
/*
* Only add fixed modes if timings/override added no mode.
*
* We should only ever have either the display timings specified
* or a fixed mode. Anything else is rather bogus.
*/
WARN_ON(panel->desc->num_timings && panel->desc->num_modes);
if (num == 0)
num = panel_simple_get_fixed_modes(panel);
connector->display_info.bpc = panel->desc->bpc;
connector->display_info.width_mm = panel->desc->size.width;
connector->display_info.height_mm = panel->desc->size.height;
@ -269,7 +317,7 @@ static int panel_simple_get_modes(struct drm_panel *panel)
}
/* add hard-coded panel modes */
num += panel_simple_get_fixed_modes(p);
num += panel_simple_get_non_edid_modes(p);
return num;
}
@ -300,10 +348,58 @@ static const struct drm_panel_funcs panel_simple_funcs = {
.get_timings = panel_simple_get_timings,
};
#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)
{
const struct panel_desc *desc = panel->desc;
struct videomode vm;
unsigned int i;
if (WARN_ON(desc->num_modes)) {
dev_err(dev, "Reject override mode: panel has a fixed mode\n");
return;
}
if (WARN_ON(!desc->num_timings)) {
dev_err(dev, "Reject override mode: no timings specified\n");
return;
}
for (i = 0; i < panel->desc->num_timings; i++) {
const struct display_timing *dt = &panel->desc->timings[i];
if (!PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, hactive) ||
!PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, hfront_porch) ||
!PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, hback_porch) ||
!PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, hsync_len) ||
!PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, vactive) ||
!PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, vfront_porch) ||
!PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, vback_porch) ||
!PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, vsync_len))
continue;
if (ot->flags != dt->flags)
continue;
videomode_from_timing(ot, &vm);
drm_display_mode_from_videomode(&vm, &panel->override_mode);
panel->override_mode.type |= DRM_MODE_TYPE_DRIVER |
DRM_MODE_TYPE_PREFERRED;
break;
}
if (WARN_ON(!panel->override_mode.type))
dev_err(dev, "Reject override mode: No display_timing found\n");
}
static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
{
struct device_node *backlight, *ddc;
struct panel_simple *panel;
struct display_timing dt;
int err;
panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
@ -349,6 +445,9 @@ 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);
drm_panel_init(&panel->base);
panel->base.dev = dev;
panel->base.funcs = &panel_simple_funcs;