diff mbox series

[RFC,5/8] drm/panel-simple: Copy "desc" into driver data; don't store a pointer

Message ID 20210722172104.RFC.5.I89640bdefeafa3b4a856f16fb7f150dc2c4b14d5@changeid (mailing list archive)
State Superseded
Headers show
Series eDP: Support probing eDP panels dynamically instead of hardcoding | expand

Commit Message

Doug Anderson July 23, 2021, 12:21 a.m. UTC
Up until now "desc" has usually pointed to one of the "static const"
objects defined in the panel-simple driver. Just storing a pointer to
one of these data elements made sense.

In a future patch to support probable eDP panels, however, it's
convenient to be able to modify the delays that the driver uses as it
starts up. One nice way to handle this is to just copy the "desc" into
our driver data instead of storing a pointer.

This has a nice side effect of simplifying the "DPI" case since we no
longer need an extra alloc there.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

 drivers/gpu/drm/panel/panel-simple.c | 84 +++++++++++++---------------
 1 file changed, 38 insertions(+), 46 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index bcdc84b20827..c08bc70f7798 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -199,7 +199,7 @@  struct panel_simple {
 	ktime_t prepared_time;
 	ktime_t unprepared_time;
 
-	const struct panel_desc *desc;
+	struct panel_desc desc;
 
 	struct regulator *supply;
 	struct i2c_adapter *ddc;
@@ -226,8 +226,8 @@  static unsigned int panel_simple_get_timings_modes(struct panel_simple *panel,
 	struct drm_display_mode *mode;
 	unsigned int i, num = 0;
 
-	for (i = 0; i < panel->desc->num_timings; i++) {
-		const struct display_timing *dt = &panel->desc->timings[i];
+	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);
@@ -242,7 +242,7 @@  static unsigned int panel_simple_get_timings_modes(struct panel_simple *panel,
 
 		mode->type |= DRM_MODE_TYPE_DRIVER;
 
-		if (panel->desc->num_timings == 1)
+		if (panel->desc.num_timings == 1)
 			mode->type |= DRM_MODE_TYPE_PREFERRED;
 
 		drm_mode_probed_add(connector, mode);
@@ -258,8 +258,8 @@  static unsigned int panel_simple_get_display_modes(struct panel_simple *panel,
 	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];
+	for (i = 0; i < panel->desc.num_modes; i++) {
+		const struct drm_display_mode *m = &panel->desc.modes[i];
 
 		mode = drm_mode_duplicate(connector->dev, m);
 		if (!mode) {
@@ -271,7 +271,7 @@  static unsigned int panel_simple_get_display_modes(struct panel_simple *panel,
 
 		mode->type |= DRM_MODE_TYPE_DRIVER;
 
-		if (panel->desc->num_modes == 1)
+		if (panel->desc.num_modes == 1)
 			mode->type |= DRM_MODE_TYPE_PREFERRED;
 
 		drm_mode_set_name(mode);
@@ -290,9 +290,6 @@  static int panel_simple_get_non_edid_modes(struct panel_simple *panel,
 	bool has_override = panel->override_mode.type;
 	unsigned int num = 0;
 
-	if (!panel->desc)
-		return 0;
-
 	if (has_override) {
 		mode = drm_mode_duplicate(connector->dev,
 					  &panel->override_mode);
@@ -305,7 +302,7 @@  static int panel_simple_get_non_edid_modes(struct panel_simple *panel,
 	}
 
 	/* Only add timings if override was not there or failed to validate */
-	if (num == 0 && panel->desc->num_timings)
+	if (num == 0 && panel->desc.num_timings)
 		num = panel_simple_get_timings_modes(panel, connector);
 
 	/*
@@ -314,17 +311,17 @@  static int panel_simple_get_non_edid_modes(struct panel_simple *panel,
 	 * 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);
+	WARN_ON(panel->desc.num_timings && panel->desc.num_modes);
 	if (num == 0)
 		num = panel_simple_get_display_modes(panel, connector);
 
-	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;
-	if (panel->desc->bus_format)
+	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;
+	if (panel->desc.bus_format)
 		drm_display_info_set_bus_formats(&connector->display_info,
-						 &panel->desc->bus_format, 1);
-	connector->display_info.bus_flags = panel->desc->bus_flags;
+						 &panel->desc.bus_format, 1);
+	connector->display_info.bus_flags = panel->desc.bus_flags;
 
 	return num;
 }
@@ -350,8 +347,8 @@  static int panel_simple_disable(struct drm_panel *panel)
 	if (!p->enabled)
 		return 0;
 
-	if (p->desc->delay.disable)
-		msleep(p->desc->delay.disable);
+	if (p->desc.delay.disable)
+		msleep(p->desc.delay.disable);
 
 	p->enabled = false;
 
@@ -364,8 +361,8 @@  static int panel_simple_suspend(struct device *dev)
 
 	gpiod_set_value_cansleep(p->enable_gpio, 0);
 
-	if (p->desc->delay.disable_to_power_off)
-		msleep(p->desc->delay.disable_to_power_off);
+	if (p->desc.delay.disable_to_power_off)
+		msleep(p->desc.delay.disable_to_power_off);
 
 	regulator_disable(p->supply);
 	p->unprepared_time = ktime_get();
@@ -416,7 +413,7 @@  static int panel_simple_prepare_once(struct panel_simple *p)
 	int hpd_asserted;
 	unsigned long hpd_wait_us;
 
-	panel_simple_wait(p->unprepared_time, p->desc->delay.unprepare);
+	panel_simple_wait(p->unprepared_time, p->desc.delay.unprepare);
 
 	err = regulator_enable(p->supply);
 	if (err < 0) {
@@ -424,20 +421,20 @@  static int panel_simple_prepare_once(struct panel_simple *p)
 		return err;
 	}
 
-	if (p->desc->delay.power_to_enable)
-		msleep(p->desc->delay.power_to_enable);
+	if (p->desc.delay.power_to_enable)
+		msleep(p->desc.delay.power_to_enable);
 
 	gpiod_set_value_cansleep(p->enable_gpio, 1);
 
-	delay = p->desc->delay.prepare;
+	delay = p->desc.delay.prepare;
 	if (p->no_hpd)
-		delay += p->desc->delay.hpd_absent_delay;
+		delay += p->desc.delay.hpd_absent_delay;
 	if (delay)
 		msleep(delay);
 
 	if (p->hpd_gpio) {
-		if (p->desc->delay.hpd_absent_delay)
-			hpd_wait_us = p->desc->delay.hpd_absent_delay * 1000UL;
+		if (p->desc.delay.hpd_absent_delay)
+			hpd_wait_us = p->desc.delay.hpd_absent_delay * 1000UL;
 		else
 			hpd_wait_us = 2000000;
 
@@ -520,10 +517,10 @@  static int panel_simple_enable(struct drm_panel *panel)
 	if (p->enabled)
 		return 0;
 
-	if (p->desc->delay.enable)
-		msleep(p->desc->delay.enable);
+	if (p->desc.delay.enable)
+		msleep(p->desc.delay.enable);
 
-	panel_simple_wait(p->prepared_time, p->desc->delay.prepare_to_enable);
+	panel_simple_wait(p->prepared_time, p->desc.delay.prepare_to_enable);
 
 	p->enabled = true;
 
@@ -566,14 +563,14 @@  static int panel_simple_get_timings(struct drm_panel *panel,
 	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 (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];
+			timings[i] = p->desc.timings[i];
 
-	return p->desc->num_timings;
+	return p->desc.num_timings;
 }
 
 static const struct drm_panel_funcs panel_simple_funcs = {
@@ -592,15 +589,12 @@  static int panel_dpi_probe(struct device *dev,
 {
 	struct display_timing *timing;
 	const struct device_node *np;
-	struct panel_desc *desc;
+	struct panel_desc *desc = &panel->desc;
 	unsigned int bus_flags;
 	struct videomode vm;
 	int ret;
 
 	np = dev->of_node;
-	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
-	if (!desc)
-		return -ENOMEM;
 
 	timing = devm_kzalloc(dev, sizeof(*timing), GFP_KERNEL);
 	if (!timing)
@@ -628,8 +622,6 @@  static int panel_dpi_probe(struct device *dev,
 	/* We do not know the connector for the DT node, so guess it */
 	desc->connector_type = DRM_MODE_CONNECTOR_DPI;
 
-	panel->desc = desc;
-
 	return 0;
 }
 
@@ -640,7 +632,7 @@  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;
+	const struct panel_desc *desc = &panel->desc;
 	struct videomode vm;
 	unsigned int i;
 
@@ -653,8 +645,8 @@  static void panel_simple_parse_panel_timing_node(struct device *dev,
 		return;
 	}
 
-	for (i = 0; i < panel->desc->num_timings; i++) {
-		const struct display_timing *dt = &panel->desc->timings[i];
+	for (i = 0; i < desc->num_timings; i++) {
+		const struct display_timing *dt = &desc->timings[i];
 
 		if (!PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, hactive) ||
 		    !PANEL_SIMPLE_BOUNDS_CHECK(ot, dt, hfront_porch) ||
@@ -696,7 +688,7 @@  static int panel_simple_probe(struct device *dev, const struct panel_desc *desc,
 
 	panel->enabled = false;
 	panel->prepared_time = 0;
-	panel->desc = desc;
+	panel->desc = *desc;
 	panel->aux = aux;
 
 	panel->no_hpd = of_property_read_bool(dev->of_node, "no-hpd");