Implement read_edid() for HDMI by implementing necessary functions to
hdmi.c and to hdmi_omap4_panel.c.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
---
drivers/video/omap2/dss/dss.h | 1 +
drivers/video/omap2/dss/hdmi.c | 60 ++++++++++++++++++---------
drivers/video/omap2/dss/hdmi_omap4_panel.c | 24 +++++++++++
3 files changed, 65 insertions(+), 20 deletions(-)
diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h
index 57b1a01..6102b80 100644
--- a/drivers/video/omap2/dss/dss.h
+++ b/drivers/video/omap2/dss/dss.h
@@ -492,6 +492,7 @@ void omapdss_hdmi_display_disable(struct omap_dss_device *dssdev);
void omapdss_hdmi_display_set_timing(struct omap_dss_device *dssdev);
int omapdss_hdmi_display_check_timing(struct omap_dss_device *dssdev,
struct omap_video_timings *timings);
+int omapdss_hdmi_read_edid(u8 *buf, int len);
int hdmi_panel_init(void);
void hdmi_panel_exit(void);
diff --git a/drivers/video/omap2/dss/hdmi.c b/drivers/video/omap2/dss/hdmi.c
index 8f8ae0e..5e66cb8 100644
--- a/drivers/video/omap2/dss/hdmi.c
+++ b/drivers/video/omap2/dss/hdmi.c
@@ -471,29 +471,32 @@ static int read_edid(u8 *pedid, u16 max_length)
{
int r = 0, n = 0, i = 0;
int max_ext_blocks = (max_length / 128) - 1;
+ int len;
r = hdmi_core_ddc_edid(pedid, 0);
- if (r) {
+ if (r)
return r;
- } else {
- n = pedid[0x7e];
- /*
- * README: need to comply with max_length set by the caller.
- * Better implementation should be to allocate necessary
- * memory to store EDID according to nb_block field found
- * in first block
- */
- if (n > max_ext_blocks)
- n = max_ext_blocks;
+ len = 128;
+ n = pedid[0x7e];
- for (i = 1; i <= n; i++) {
- r = hdmi_core_ddc_edid(pedid, i);
- if (r)
- return r;
- }
+ /*
+ * README: need to comply with max_length set by the caller.
+ * Better implementation should be to allocate necessary
+ * memory to store EDID according to nb_block field found
+ * in first block
+ */
+ if (n > max_ext_blocks)
+ n = max_ext_blocks;
+
+ for (i = 1; i <= n; i++) {
+ r = hdmi_core_ddc_edid(pedid, i);
+ if (r)
+ return r;
+ len += 128;
}
- return 0;
+
+ return len;
}
static int get_timings_index(void)
@@ -660,7 +663,7 @@ static void hdmi_read_edid(struct omap_video_timings *dp)
if (!hdmi.edid_set)
ret = read_edid(hdmi.edid, HDMI_EDID_MAX_LENGTH);
- if (!ret) {
+ if (ret > 0) {
if (!memcmp(hdmi.edid, edid_header, sizeof(edid_header))) {
/* search for timings of default resolution */
get_edid_timing_data(hdmi.edid);
@@ -1242,6 +1245,23 @@ void omapdss_hdmi_display_set_timing(struct omap_dss_device *dssdev)
}
}
+int omapdss_hdmi_read_edid(u8 *buf, int len)
+{
+ int r;
+
+ mutex_lock(&hdmi.lock);
+
+ r = hdmi_runtime_get();
+ BUG_ON(r);
+
+ r = read_edid(buf, len);
+
+ hdmi_runtime_put();
+ mutex_unlock(&hdmi.lock);
+
+ return r;
+}
+
int omapdss_hdmi_display_enable(struct omap_dss_device *dssdev)
{
int r = 0;
diff --git a/drivers/video/omap2/dss/hdmi_omap4_panel.c b/drivers/video/omap2/dss/hdmi_omap4_panel.c
index 25d5fb2..7adaf7a 100644
--- a/drivers/video/omap2/dss/hdmi_omap4_panel.c
+++ b/drivers/video/omap2/dss/hdmi_omap4_panel.c
@@ -185,6 +185,29 @@ err:
return r;
}
+static int hdmi_read_edid(struct omap_dss_device *dssdev, u8 *buf, int len)
+{
+ int r;
+
+ mutex_lock(&hdmi.hdmi_lock);
+
+ if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
+ r = omapdss_hdmi_display_enable(dssdev);
+ if (r)
+ goto err;
+ }
+
+ r = omapdss_hdmi_read_edid(buf, len);
+
+ if (dssdev->state == OMAP_DSS_DISPLAY_DISABLED ||
+ dssdev->state == OMAP_DSS_DISPLAY_SUSPENDED)
+ omapdss_hdmi_display_disable(dssdev);
+err:
+ mutex_unlock(&hdmi.hdmi_lock);
+
+ return r;
+}
+
static struct omap_dss_driver hdmi_driver = {
.probe = hdmi_panel_probe,
.remove = hdmi_panel_remove,
@@ -195,6 +218,7 @@ static struct omap_dss_driver hdmi_driver = {
.get_timings = hdmi_get_timings,
.set_timings = hdmi_set_timings,
.check_timings = hdmi_check_timings,
+ .read_edid = hdmi_read_edid,
.driver = {
.name = "hdmi_panel",
.owner = THIS_MODULE,
--
1.7.4.1
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