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Date: Tue, 14 Feb 2017 23:20:22 +0200
From: Sakari Ailus <sakari.ailus@....fi>
To: Pavel Machek <pavel@....cz>
Cc: sre@...nel.org, pali.rohar@...il.com, linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org, laurent.pinchart@...asonboard.com,
mchehab@...nel.org, ivo.g.dimitrov.75@...il.com
Subject: Re: [RFC 03/13] v4l: split lane parsing code
Hi Pavel,
On Tue, Feb 14, 2017 at 02:39:41PM +0100, Pavel Machek wrote:
> From: Sakari Ailus <sakari.ailus@....fi>
>
> The function to parse CSI2 bus parameters was called
> v4l2_of_parse_csi_bus(), rename it as v4l2_of_parse_csi2_bus() in
> anticipation of CSI1/CCP2 support.
>
> Obtain data bus type from bus-type property. Only try parsing bus
> specific properties in this case.
>
> Separate lane parsing from CSI-2 bus parameter parsing. The CSI-1 will
> need these as well, separate them into a different
> function. have_clk_lane and num_data_lanes arguments may be NULL; the
> CSI-1 bus will have no use for them.
>
> Add support for parsing of CSI-1 and CCP2 bus related properties
> documented in video-interfaces.txt.
>
> Signed-off-by: Sakari Ailus <sakari.ailus@....fi>
> Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
> Signed-off-by: Pavel Machek <pavel@....cz>
> ---
> drivers/media/v4l2-core/v4l2-of.c | 141 ++++++++++++++++++++++++++++++--------
> 1 file changed, 114 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-of.c b/drivers/media/v4l2-core/v4l2-of.c
> index 4f59f44..9ffe2d3 100644
> --- a/drivers/media/v4l2-core/v4l2-of.c
> +++ b/drivers/media/v4l2-core/v4l2-of.c
> @@ -20,64 +20,101 @@
>
> #include <media/v4l2-of.h>
>
> -static int v4l2_of_parse_csi_bus(const struct device_node *node,
> - struct v4l2_of_endpoint *endpoint)
> +enum v4l2_of_bus_type {
> + V4L2_OF_BUS_TYPE_CSI2 = 0,
> + V4L2_OF_BUS_TYPE_PARALLEL,
> + V4L2_OF_BUS_TYPE_CSI1,
> + V4L2_OF_BUS_TYPE_CCP2,
> +};
This no longer matches the bus-type values in DT bindings. How about:
V4L2_OF_BUS_TYPE_GUESS, /* CSI-2 D-PHY, parallel or Bt.656 */
V4L2_OF_BUS_TYPE_CSI2_CPHY,
V4L2_OF_BUS_TYPE_CSI1,
V4L2_OF_BUS_TYPE_CCP2
> +
> +static int v4l2_of_parse_lanes(const struct device_node *node,
> + unsigned char *clock_lane,
> + bool *have_clk_lane,
> + unsigned char *data_lanes,
> + bool *lane_polarities,
> + unsigned short *__num_data_lanes,
> + unsigned int max_data_lanes)
> {
> - struct v4l2_of_bus_mipi_csi2 *bus = &endpoint->bus.mipi_csi2;
> struct property *prop;
> - bool have_clk_lane = false;
> - unsigned int flags = 0, lanes_used = 0;
> + unsigned int lanes_used = 0;
> + short num_data_lanes = 0;
> u32 v;
>
> prop = of_find_property(node, "data-lanes", NULL);
> if (prop) {
> const __be32 *lane = NULL;
> - unsigned int i;
>
> - for (i = 0; i < ARRAY_SIZE(bus->data_lanes); i++) {
> + for (num_data_lanes = 0; num_data_lanes < max_data_lanes;
> + num_data_lanes++) {
> lane = of_prop_next_u32(prop, lane, &v);
> if (!lane)
> break;
> + data_lanes[num_data_lanes] = v;
>
> if (lanes_used & BIT(v))
> pr_warn("%s: duplicated lane %u in data-lanes\n",
> node->full_name, v);
> lanes_used |= BIT(v);
> -
> - bus->data_lanes[i] = v;
> }
> - bus->num_data_lanes = i;
> }
> + if (__num_data_lanes)
> + *__num_data_lanes = num_data_lanes;
>
> prop = of_find_property(node, "lane-polarities", NULL);
> if (prop) {
> const __be32 *polarity = NULL;
> unsigned int i;
>
> - for (i = 0; i < ARRAY_SIZE(bus->lane_polarities); i++) {
> + for (i = 0; i < 1 + max_data_lanes; i++) {
> polarity = of_prop_next_u32(prop, polarity, &v);
> if (!polarity)
> break;
> - bus->lane_polarities[i] = v;
> + lane_polarities[i] = v;
> }
>
> - if (i < 1 + bus->num_data_lanes /* clock + data */) {
> + if (i < 1 + num_data_lanes /* clock + data */) {
> pr_warn("%s: too few lane-polarities entries (need %u, got %u)\n",
> - node->full_name, 1 + bus->num_data_lanes, i);
> + node->full_name, 1 + num_data_lanes, i);
> return -EINVAL;
> }
> }
>
> + if (have_clk_lane)
> + *have_clk_lane = false;
> +
> if (!of_property_read_u32(node, "clock-lanes", &v)) {
> + *clock_lane = v;
> + if (have_clk_lane)
> + *have_clk_lane = true;
> +
> if (lanes_used & BIT(v))
> pr_warn("%s: duplicated lane %u in clock-lanes\n",
> node->full_name, v);
> lanes_used |= BIT(v);
> -
> - bus->clock_lane = v;
> - have_clk_lane = true;
> }
>
> + return 0;
> +}
> +
> +static int v4l2_of_parse_csi2_bus(const struct device_node *node,
> + struct v4l2_of_endpoint *endpoint)
> +{
> + struct v4l2_of_bus_mipi_csi2 *bus = &endpoint->bus.mipi_csi2;
> + bool have_clk_lane = false;
> + unsigned int flags = 0;
> + int rval;
> + u32 v;
> +
> + rval = v4l2_of_parse_lanes(node, &bus->clock_lane, &have_clk_lane,
> + bus->data_lanes, bus->lane_polarities,
> + &bus->num_data_lanes,
> + ARRAY_SIZE(bus->data_lanes));
> + if (rval)
> + return rval;
> +
> + BUILD_BUG_ON(1 + ARRAY_SIZE(bus->data_lanes)
> + != ARRAY_SIZE(bus->lane_polarities));
> +
> if (of_get_property(node, "clock-noncontinuous", &v))
> flags |= V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
> else if (have_clk_lane || bus->num_data_lanes > 0)
> @@ -139,6 +176,35 @@ static void v4l2_of_parse_parallel_bus(const struct device_node *node,
>
> }
>
> +void v4l2_of_parse_csi1_bus(const struct device_node *node,
> + struct v4l2_of_endpoint *endpoint,
> + enum v4l2_of_bus_type bus_type)
> +{
> + struct v4l2_of_bus_mipi_csi1 *bus = &endpoint->bus.mipi_csi1;
> + u32 v;
> +
> + v4l2_of_parse_lanes(node, &bus->clock_lane, NULL,
> + &bus->data_lane, bus->lane_polarity,
> + NULL, 1);
> +
> + if (!of_property_read_u32(node, "clock-inv", &v))
> + bus->clock_inv = v;
> +
> + if (!of_property_read_u32(node, "strobe", &v))
> + bus->strobe = v;
> +
> + if (!of_property_read_u32(node, "data-lane", &v))
> + bus->data_lane = v;
> +
> + if (!of_property_read_u32(node, "clock-lane", &v))
> + bus->clock_lane = v;
> +
> + if (bus_type == V4L2_OF_BUS_TYPE_CSI1)
> + endpoint->bus_type = V4L2_MBUS_CSI1;
> + else
> + endpoint->bus_type = V4L2_MBUS_CCP2;
> +}
> +
> /**
> * v4l2_of_parse_endpoint() - parse all endpoint node properties
> * @node: pointer to endpoint device_node
> @@ -162,6 +228,7 @@ static void v4l2_of_parse_parallel_bus(const struct device_node *node,
> int v4l2_of_parse_endpoint(const struct device_node *node,
> struct v4l2_of_endpoint *endpoint)
> {
> + u32 bus_type;
You could assign bus_type as 0 here...
> int rval;
>
> of_graph_parse_endpoint(node, &endpoint->base);
> @@ -169,17 +236,37 @@ int v4l2_of_parse_endpoint(const struct device_node *node,
> memset(&endpoint->bus_type, 0, sizeof(*endpoint) -
> offsetof(typeof(*endpoint), bus_type));
>
> - rval = v4l2_of_parse_csi_bus(node, endpoint);
> - if (rval)
> - return rval;
> - /*
> - * Parse the parallel video bus properties only if none
> - * of the MIPI CSI-2 specific properties were found.
> - */
> - if (endpoint->bus.mipi_csi2.flags == 0)
> - v4l2_of_parse_parallel_bus(node, endpoint);
> + rval = of_property_read_u32(node, "bus-type", &bus_type);
> + if (rval < 0) {
...and remove the check. What's below would be done in the _GUESS case.
> + endpoint->bus_type = 0;
> + rval = v4l2_of_parse_csi2_bus(node, endpoint);
> + if (rval)
> + return rval;
> + /*
> + * Parse the parallel video bus properties only if none
> + * of the MIPI CSI-2 specific properties were found.
> + */
> + if (endpoint->bus.mipi_csi2.flags == 0)
> + v4l2_of_parse_parallel_bus(node, endpoint);
> +
> + return 0;
> + }
>
> - return 0;
> + switch (bus_type) {
> + case V4L2_OF_BUS_TYPE_CSI2:
> + return v4l2_of_parse_csi2_bus(node, endpoint);
> + case V4L2_OF_BUS_TYPE_PARALLEL:
> + v4l2_of_parse_parallel_bus(node, endpoint);
> + return 0;
And you can remove CSI2 and PARALLEL cases.
> + case V4L2_OF_BUS_TYPE_CSI1:
> + case V4L2_OF_BUS_TYPE_CCP2:
> + v4l2_of_parse_csi1_bus(node, endpoint, bus_type);
> + return 0;
> + default:
> + pr_warn("bad bus-type %u, device_node \"%s\"\n",
> + bus_type, node->full_name);
> + return -EINVAL;
> + }
> }
> EXPORT_SYMBOL(v4l2_of_parse_endpoint);
>
--
Kind regards,
Sakari Ailus
e-mail: sakari.ailus@....fi XMPP: sailus@...iisi.org.uk
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