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drm/omap: Don't call EDID read operation recursively 

Instead of calling the EDID read operation (.read_edid()) recursively
from the display device back to the first device that provides EDID read
support, iterate over the devices manually in the DRM connector code.
This moves the complexity to a single central location and simplifies
the logic in omap_dss_device drivers.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Laurent Pinchart 2018-05-31 22:09:14 +03:00 committed by Tomi Valkeinen
parent f006325cdc
commit 90279e9518
6 changed files with 65 additions and 77 deletions
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15
drivers/gpu/drm/omapdrm/displays/connector-dvi.c
View File

@ -166,12 +166,6 @@ static int dvic_read_edid(struct omap_dss_device *dssdev,
struct panel_drv_data *ddata = to_panel_data(dssdev);
int r, l, bytes_read;
if (ddata->hpd_gpio && !gpiod_get_value_cansleep(ddata->hpd_gpio))
return -ENODEV;
if (!ddata->i2c_adapter)
return -ENODEV;
l = min(EDID_LENGTH, len);
r = dvic_ddc_read(ddata->i2c_adapter, edid, l, 0);
if (r)
@ -341,10 +335,11 @@ static int dvic_probe(struct platform_device *pdev)
dssdev->of_ports = BIT(0);
if (ddata->hpd_gpio)
dssdev->ops_flags = OMAP_DSS_DEVICE_OP_DETECT
| OMAP_DSS_DEVICE_OP_HPD;
else if (ddata->i2c_adapter)
dssdev->ops_flags = OMAP_DSS_DEVICE_OP_DETECT;
dssdev->ops_flags |= OMAP_DSS_DEVICE_OP_DETECT
| OMAP_DSS_DEVICE_OP_HPD;
if (ddata->i2c_adapter)
dssdev->ops_flags |= OMAP_DSS_DEVICE_OP_DETECT
| OMAP_DSS_DEVICE_OP_EDID;
omapdss_display_init(dssdev);
omapdss_device_register(dssdev);

11
drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
View File

@ -15,8 +15,6 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <drm/drm_edid.h>
#include "../dss/omapdss.h"
static const struct videomode hdmic_default_vm = {
@ -126,14 +124,6 @@ static int hdmic_check_timings(struct omap_dss_device *dssdev,
return src->ops->check_timings(src, vm);
}
static int hdmic_read_edid(struct omap_dss_device *dssdev,
u8 *edid, int len)
{
struct omap_dss_device *src = dssdev->src;
return src->ops->read_edid(src, edid, len);
}
static bool hdmic_detect(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
@ -190,7 +180,6 @@ static const struct omap_dss_device_ops hdmic_ops = {
.get_timings = hdmic_get_timings,
.check_timings = hdmic_check_timings,
.read_edid = hdmic_read_edid,
.detect = hdmic_detect,
.register_hpd_cb = hdmic_register_hpd_cb,
.unregister_hpd_cb = hdmic_unregister_hpd_cb,

13
drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c
View File

@ -115,18 +115,6 @@ static int tpd_check_timings(struct omap_dss_device *dssdev,
return src->ops->check_timings(src, vm);
}
static int tpd_read_edid(struct omap_dss_device *dssdev,
u8 *edid, int len)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
struct omap_dss_device *src = dssdev->src;
if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
return -ENODEV;
return src->ops->read_edid(src, edid, len);
}
static bool tpd_detect(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
@ -180,7 +168,6 @@ static const struct omap_dss_device_ops tpd_ops = {
.disable = tpd_disable,
.check_timings = tpd_check_timings,
.set_timings = tpd_set_timings,
.read_edid = tpd_read_edid,
.detect = tpd_detect,
.register_hpd_cb = tpd_register_hpd_cb,
.unregister_hpd_cb = tpd_unregister_hpd_cb,

1
drivers/gpu/drm/omapdrm/dss/hdmi4.c
View File

@ -711,6 +711,7 @@ static int hdmi4_init_output(struct omap_hdmi *hdmi)
out->ops = &hdmi_ops;
out->owner = THIS_MODULE;
out->of_ports = BIT(0);
out->ops_flags = OMAP_DSS_DEVICE_OP_EDID;
out->next = omapdss_of_find_connected_device(out->dev->of_node, 0);
if (IS_ERR(out->next)) {

1
drivers/gpu/drm/omapdrm/dss/hdmi5.c
View File

@ -703,6 +703,7 @@ static int hdmi5_init_output(struct omap_hdmi *hdmi)
out->ops = &hdmi_ops;
out->owner = THIS_MODULE;
out->of_ports = BIT(0);
out->ops_flags = OMAP_DSS_DEVICE_OP_EDID;
out->next = omapdss_of_find_connected_device(out->dev->of_node, 0);
if (IS_ERR(out->next)) {

101
drivers/gpu/drm/omapdrm/omap_connector.c
View File

@ -170,65 +170,80 @@ static void omap_connector_destroy(struct drm_connector *connector)
#define MAX_EDID 512
static int omap_connector_get_modes_edid(struct drm_connector *connector,
struct omap_dss_device *dssdev)
{
struct omap_connector *omap_connector = to_omap_connector(connector);
enum drm_connector_status status;
void *edid;
int n;
status = omap_connector_detect(connector, false);
if (status != connector_status_connected)
goto no_edid;
edid = kzalloc(MAX_EDID, GFP_KERNEL);
if (!edid)
goto no_edid;
if (dssdev->ops->read_edid(dssdev, edid, MAX_EDID) <= 0 ||
!drm_edid_is_valid(edid)) {
kfree(edid);
goto no_edid;
}
drm_connector_update_edid_property(connector, edid);
n = drm_add_edid_modes(connector, edid);
omap_connector->hdmi_mode = drm_detect_hdmi_monitor(edid);
kfree(edid);
return n;
no_edid:
drm_connector_update_edid_property(connector, NULL);
return 0;
}
static int omap_connector_get_modes(struct drm_connector *connector)
{
struct omap_connector *omap_connector = to_omap_connector(connector);
struct omap_dss_device *dssdev = omap_connector->dssdev;
struct drm_device *dev = connector->dev;
int n = 0;
struct omap_dss_device *dssdev;
struct drm_display_mode *mode;
struct videomode vm = {0};
DBG("%s", omap_connector->dssdev->name);
/* if display exposes EDID, then we parse that in the normal way to
* build table of supported modes.. otherwise (ie. fixed resolution
/*
* If display exposes EDID, then we parse that in the normal way to
* build table of supported modes. Otherwise (ie. fixed resolution
* LCD panels) we just return a single mode corresponding to the
* currently configured timings:
* currently configured timings.
*/
if (dssdev->ops->read_edid) {
void *edid = kzalloc(MAX_EDID, GFP_KERNEL);
dssdev = omap_connector_find_device(connector,
OMAP_DSS_DEVICE_OP_EDID);
if (dssdev)
return omap_connector_get_modes_edid(connector, dssdev);
if (!edid)
return 0;
mode = drm_mode_create(connector->dev);
if (!mode)
return 0;
if ((dssdev->ops->read_edid(dssdev, edid, MAX_EDID) > 0) &&
drm_edid_is_valid(edid)) {
drm_connector_update_edid_property(
connector, edid);
n = drm_add_edid_modes(connector, edid);
dssdev = omap_connector->dssdev;
dssdev->ops->get_timings(dssdev, &vm);
omap_connector->hdmi_mode =
drm_detect_hdmi_monitor(edid);
} else {
drm_connector_update_edid_property(
connector, NULL);
}
drm_display_mode_from_videomode(&vm, mode);
kfree(edid);
} else {
struct drm_display_mode *mode = drm_mode_create(dev);
struct videomode vm = {0};
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
if (!mode)
return 0;
dssdev->ops->get_timings(dssdev, &vm);
drm_display_mode_from_videomode(&vm, mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
drm_mode_set_name(mode);
drm_mode_probed_add(connector, mode);
if (dssdev->driver && dssdev->driver->get_size) {
dssdev->driver->get_size(dssdev,
if (dssdev->driver && dssdev->driver->get_size)
dssdev->driver->get_size(dssdev,
&connector->display_info.width_mm,
&connector->display_info.height_mm);
}
n = 1;
}
return n;
return 1;
}
static int omap_connector_mode_valid(struct drm_connector *connector,