[PATCH 18/21] drm/omap: Don't call EDID read operation recursively
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Wed Jun 6 09:36:47 UTC 2018
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 at ideasonboard.com>
---
drivers/gpu/drm/omapdrm/displays/connector-dvi.c | 15 +--
drivers/gpu/drm/omapdrm/displays/connector-hdmi.c | 11 ---
.../gpu/drm/omapdrm/displays/encoder-tpd12s015.c | 13 ---
drivers/gpu/drm/omapdrm/dss/hdmi4.c | 1 +
drivers/gpu/drm/omapdrm/dss/hdmi5.c | 1 +
drivers/gpu/drm/omapdrm/omap_connector.c | 101 ++++++++++++---------
6 files changed, 65 insertions(+), 77 deletions(-)
diff --git a/drivers/gpu/drm/omapdrm/displays/connector-dvi.c b/drivers/gpu/drm/omapdrm/displays/connector-dvi.c
index 6be260ff6458..eae4108330f1 100644
--- a/drivers/gpu/drm/omapdrm/displays/connector-dvi.c
+++ b/drivers/gpu/drm/omapdrm/displays/connector-dvi.c
@@ -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);
diff --git a/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c b/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
index 6f2364afb14a..16dc22edcb8e 100644
--- a/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
+++ b/drivers/gpu/drm/omapdrm/displays/connector-hdmi.c
@@ -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,
diff --git a/drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c b/drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c
index 2772af84531a..dbbf9683bd51 100644
--- a/drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c
+++ b/drivers/gpu/drm/omapdrm/displays/encoder-tpd12s015.c
@@ -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,
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4.c b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
index bebce93fed3e..c92564300446 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
@@ -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)) {
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi5.c b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
index 7c07e0208107..2aaa8ee61662 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi5.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
@@ -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)) {
diff --git a/drivers/gpu/drm/omapdrm/omap_connector.c b/drivers/gpu/drm/omapdrm/omap_connector.c
index 1b3f85a02c85..a1d379816732 100644
--- a/drivers/gpu/drm/omapdrm/omap_connector.c
+++ b/drivers/gpu/drm/omapdrm/omap_connector.c
@@ -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_mode_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_mode_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);
-
- if (!edid)
- return 0;
-
- if ((dssdev->ops->read_edid(dssdev, edid, MAX_EDID) > 0) &&
- drm_edid_is_valid(edid)) {
- drm_mode_connector_update_edid_property(
- connector, edid);
- n = drm_add_edid_modes(connector, edid);
-
- omap_connector->hdmi_mode =
- drm_detect_hdmi_monitor(edid);
- } else {
- drm_mode_connector_update_edid_property(
- connector, NULL);
- }
-
- kfree(edid);
- } else {
- struct drm_display_mode *mode = drm_mode_create(dev);
- struct videomode vm = {0};
+ dssdev = omap_connector_find_device(connector,
+ OMAP_DSS_DEVICE_OP_EDID);
+ if (dssdev)
+ return omap_connector_get_modes_edid(connector, dssdev);
- if (!mode)
- return 0;
+ mode = drm_mode_create(connector->dev);
+ if (!mode)
+ return 0;
- dssdev->ops->get_timings(dssdev, &vm);
+ dssdev = omap_connector->dssdev;
+ dssdev->ops->get_timings(dssdev, &vm);
- drm_display_mode_from_videomode(&vm, mode);
+ 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);
+ 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,
--
Regards,
Laurent Pinchart
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