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drm/bridge: tfp410: fix de-skew value retrieval from DT 

The tfp410 has a data de-skew feature that allows the user to compensate
the skew between IDCK and the pixel data and control signals.

In the driver, the setup and hold times are calculated from the de-skew
value. This retrieves the deskew value from the DT using the proper
datatype and range check as described by the binding (u32 from 0 to 7).

This fix results from a change in the ti,tfp410 DT binding.

Signed-off-by: Ricardo Cañuelo <ricardo.canuelo@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200617094633.19663-4-ricardo.canuelo@collabora.com
This commit is contained in:
Ricardo Cañuelo 2020-06-17 11:46:32 +02:00 committed by Sam Ravnborg
parent 520a994de0
commit db8f92a5e6
1 changed files with 5 additions and 5 deletions
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10
drivers/gpu/drm/bridge/ti-tfp410.c
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@ -220,7 +220,7 @@ static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
struct device_node *ep;
u32 pclk_sample = 0;
u32 bus_width = 24;
s32 deskew = 0;
u32 deskew = 0;
/* Start with defaults. */
*timings = tfp410_default_timings;
@ -274,12 +274,12 @@ static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
}
/* Get the setup and hold time from vendor-specific properties. */
of_property_read_u32(dvi->dev->of_node, "ti,deskew", (u32 *)&deskew);
if (deskew < -4 || deskew > 3)
of_property_read_u32(dvi->dev->of_node, "ti,deskew", &deskew);
if (deskew > 7)
return -EINVAL;
timings->setup_time_ps = min(0, 1200 - 350 * deskew);
timings->hold_time_ps = min(0, 1300 + 350 * deskew);
timings->setup_time_ps = min(0, 1200 - 350 * ((s32)deskew - 4));
timings->hold_time_ps = min(0, 1300 + 350 * ((s32)deskew - 4));
return 0;
}