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media: v4l: fwnode: Read lane inversion information despite lane numbering 

Read the lane inversion independently of whether the "data-lanes" property
exists. This makes sense since the caller may pass the number of lanes as
the default configuration while the lane inversion configuration may still
be available in firmware.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Tested-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Sakari Ailus 2018-07-18 09:33:45 -04:00 committed by Mauro Carvalho Chehab
parent 175b18b82d
commit 276565ed7e
1 changed files with 36 additions and 31 deletions
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67
drivers/media/v4l2-core/v4l2-fwnode.c
View File

@ -43,26 +43,31 @@ enum v4l2_fwnode_bus_type {
};
static int v4l2_fwnode_endpoint_parse_csi2_bus(struct fwnode_handle *fwnode,
struct v4l2_fwnode_endpoint *vep)
struct v4l2_fwnode_endpoint *vep,
enum v4l2_fwnode_bus_type bus_type)
{
struct v4l2_fwnode_bus_mipi_csi2 *bus = &vep->bus.mipi_csi2;
bool have_clk_lane = false;
unsigned int flags = 0, lanes_used = 0;
u32 array[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES];
unsigned int num_data_lanes = 0;
unsigned int i;
u32 v;
int rval;
if (bus_type == V4L2_FWNODE_BUS_TYPE_CSI2_DPHY)
num_data_lanes = min_t(u32, bus->num_data_lanes,
V4L2_FWNODE_CSI2_MAX_DATA_LANES);
rval = fwnode_property_read_u32_array(fwnode, "data-lanes", NULL, 0);
if (rval > 0) {
u32 array[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES];
bus->num_data_lanes =
num_data_lanes =
min_t(int, V4L2_FWNODE_CSI2_MAX_DATA_LANES, rval);
fwnode_property_read_u32_array(fwnode, "data-lanes", array,
bus->num_data_lanes);
num_data_lanes);
for (i = 0; i < bus->num_data_lanes; i++) {
for (i = 0; i < num_data_lanes; i++) {
if (lanes_used & BIT(array[i]))
pr_warn("duplicated lane %u in data-lanes\n",
array[i]);
@ -71,30 +76,27 @@ static int v4l2_fwnode_endpoint_parse_csi2_bus(struct fwnode_handle *fwnode,
bus->data_lanes[i] = array[i];
pr_debug("lane %u position %u\n", i, array[i]);
}
}
rval = fwnode_property_read_u32_array(fwnode,
"lane-polarities", NULL,
0);
if (rval > 0) {
if (rval != 1 + bus->num_data_lanes /* clock+data */) {
pr_warn("invalid number of lane-polarities entries (need %u, got %u)\n",
1 + bus->num_data_lanes, rval);
return -EINVAL;
}
fwnode_property_read_u32_array(fwnode,
"lane-polarities", array,
1 + bus->num_data_lanes);
for (i = 0; i < 1 + bus->num_data_lanes; i++) {
bus->lane_polarities[i] = array[i];
pr_debug("lane %u polarity %sinverted",
i, array[i] ? "" : "not ");
}
} else {
pr_debug("no lane polarities defined, assuming not inverted\n");
rval = fwnode_property_read_u32_array(fwnode, "lane-polarities", NULL,
0);
if (rval > 0) {
if (rval != 1 + num_data_lanes /* clock+data */) {
pr_warn("invalid number of lane-polarities entries (need %u, got %u)\n",
1 + num_data_lanes, rval);
return -EINVAL;
}
fwnode_property_read_u32_array(fwnode, "lane-polarities", array,
1 + num_data_lanes);
for (i = 0; i < 1 + num_data_lanes; i++) {
bus->lane_polarities[i] = array[i];
pr_debug("lane %u polarity %sinverted",
i, array[i] ? "" : "not ");
}
} else {
pr_debug("no lane polarities defined, assuming not inverted\n");
}
if (!fwnode_property_read_u32(fwnode, "clock-lanes", &v)) {
@ -114,10 +116,11 @@ static int v4l2_fwnode_endpoint_parse_csi2_bus(struct fwnode_handle *fwnode,
flags |= V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
}
if (lanes_used || have_clk_lane ||
(flags & ~V4L2_MBUS_CSI2_CONTINUOUS_CLOCK)) {
if (bus_type == V4L2_FWNODE_BUS_TYPE_CSI2_DPHY || lanes_used ||
have_clk_lane || (flags & ~V4L2_MBUS_CSI2_CONTINUOUS_CLOCK)) {
bus->flags = flags;
vep->bus_type = V4L2_MBUS_CSI2_DPHY;
bus->num_data_lanes = num_data_lanes;
}
return 0;
@ -268,7 +271,8 @@ static int __v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode,
switch (bus_type) {
case V4L2_FWNODE_BUS_TYPE_GUESS:
rval = v4l2_fwnode_endpoint_parse_csi2_bus(fwnode, vep);
rval = v4l2_fwnode_endpoint_parse_csi2_bus(fwnode, vep,
bus_type);
if (rval)
return rval;
@ -284,7 +288,8 @@ static int __v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode,
break;
case V4L2_FWNODE_BUS_TYPE_CSI2_DPHY:
vep->bus_type = V4L2_MBUS_CSI2_DPHY;
rval = v4l2_fwnode_endpoint_parse_csi2_bus(fwnode, vep);
rval = v4l2_fwnode_endpoint_parse_csi2_bus(fwnode, vep,
bus_type);
if (rval)
return rval;