diff options
| author | Jim Lodes <jim.lodes@garmin.com> | 2016-04-21 12:27:49 -0500 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2016-05-31 08:20:43 +0300 |
| commit | 4bafcbc77fb0b26b0052dbd577ccc888a63e6404 (patch) | |
| tree | c6cf8c8f7142718a62710e3cdd767a17f9b1729a /drivers | |
| parent | 08f707ac3eb1fa86c43c705f9f78c1e40c49aba1 (diff) | |
OMAPDSS: HDMI5: Change DDC timings
The DDC scl high and low times were set to the minimum values
from the i2c specification, but the i2c specification takes into
account the rise time and fall time to calculate the frequency.
To pass HDMI certification DDC can not exceed 100kHz therefore in
a system where the rise times and fall times are negligible the high
and low times for scl need to be 10us.
Signed-off-by: Jim Lodes <jim.lodes@garmin.com>
Signed-off-by: J.D. Schroeder <jay.schroeder@garmin.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/dss/hdmi5_core.c | 4 | ||||
| -rw-r--r-- | drivers/video/fbdev/omap2/omapfb/dss/hdmi5_core.c | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c b/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c index f9a2d4377e45..8ab2093daa12 100644 --- a/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c +++ b/drivers/gpu/drm/omapdrm/dss/hdmi5_core.c @@ -51,8 +51,8 @@ static void hdmi_core_ddc_init(struct hdmi_core_data *core) { void __iomem *base = core->base; const unsigned long long iclk = 266000000; /* DSS L3 ICLK */ - const unsigned ss_scl_high = 4000; /* ns */ - const unsigned ss_scl_low = 4700; /* ns */ + const unsigned ss_scl_high = 4600; /* ns */ + const unsigned ss_scl_low = 5400; /* ns */ const unsigned fs_scl_high = 600; /* ns */ const unsigned fs_scl_low = 1300; /* ns */ const unsigned sda_hold = 1000; /* ns */ diff --git a/drivers/video/fbdev/omap2/omapfb/dss/hdmi5_core.c b/drivers/video/fbdev/omap2/omapfb/dss/hdmi5_core.c index fc5eceeddf9c..bbfe7e2d4332 100644 --- a/drivers/video/fbdev/omap2/omapfb/dss/hdmi5_core.c +++ b/drivers/video/fbdev/omap2/omapfb/dss/hdmi5_core.c @@ -51,8 +51,8 @@ static void hdmi_core_ddc_init(struct hdmi_core_data *core) { void __iomem *base = core->base; const unsigned long long iclk = 266000000; /* DSS L3 ICLK */ - const unsigned ss_scl_high = 4000; /* ns */ - const unsigned ss_scl_low = 4700; /* ns */ + const unsigned ss_scl_high = 4600; /* ns */ + const unsigned ss_scl_low = 5400; /* ns */ const unsigned fs_scl_high = 600; /* ns */ const unsigned fs_scl_low = 1300; /* ns */ const unsigned sda_hold = 1000; /* ns */ |