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Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0153-media-tc358743-fix-connected-active-CSI-2-lane-repor.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0153-media-tc358743-fix-connected-active-CSI-2-lane-repor.patch74
1 files changed, 74 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0153-media-tc358743-fix-connected-active-CSI-2-lane-repor.patch b/target/linux/bcm27xx/patches-5.4/950-0153-media-tc358743-fix-connected-active-CSI-2-lane-repor.patch
new file mode 100644
index 0000000000..2357c878d7
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0153-media-tc358743-fix-connected-active-CSI-2-lane-repor.patch
@@ -0,0 +1,74 @@
+From d318c95f164150bee4dbd875c3d9354665738f17 Mon Sep 17 00:00:00 2001
+From: Philipp Zabel <p.zabel@pengutronix.de>
+Date: Thu, 21 Sep 2017 17:30:24 +0200
+Subject: [PATCH] media: tc358743: fix connected/active CSI-2 lane
+ reporting
+
+g_mbus_config was supposed to indicate all supported lane numbers, not
+only the number of those currently in active use. Since the TC358743
+can dynamically reduce the number of active lanes if the required
+bandwidth allows for it, report all lane numbers up to the connected
+number of lanes as supported in pdata mode.
+In device tree mode, do not report lane count and clock mode at all, as
+the receiver driver can determine these from the device tree.
+
+To allow communicating the number of currently active lanes, add a new
+bitfield to the v4l2_mbus_config flags. This is a temporary fix, to be
+used only until a better solution is found.
+
+Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
+---
+ drivers/media/i2c/tc358743.c | 14 ++++++++++++--
+ include/media/v4l2-mediabus.h | 8 ++++++++
+ 2 files changed, 20 insertions(+), 2 deletions(-)
+
+--- a/drivers/media/i2c/tc358743.c
++++ b/drivers/media/i2c/tc358743.c
+@@ -1608,11 +1608,20 @@ static int tc358743_g_mbus_config(struct
+ struct v4l2_mbus_config *cfg)
+ {
+ struct tc358743_state *state = to_state(sd);
++ const u32 mask = V4L2_MBUS_CSI2_LANE_MASK;
++
++ if (state->csi_lanes_in_use > state->bus.num_data_lanes)
++ return -EINVAL;
+
+ cfg->type = V4L2_MBUS_CSI2_DPHY;
++ cfg->flags = (state->csi_lanes_in_use << __ffs(mask)) & mask;
++
++ /* In DT mode, only report the number of active lanes */
++ if (sd->dev->of_node)
++ return 0;
+
+- /* Support for non-continuous CSI-2 clock is missing in the driver */
+- cfg->flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
++ /* Support for non-continuous CSI-2 clock is missing in pdate mode */
++ cfg->flags |= V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
+
+ switch (state->csi_lanes_in_use) {
+ case 1:
+@@ -2054,6 +2063,7 @@ static int tc358743_probe(struct i2c_cli
+ if (pdata) {
+ state->pdata = *pdata;
+ state->bus.flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
++ state->bus.num_data_lanes = 4;
+ } else {
+ err = tc358743_probe_of(state);
+ if (err == -ENODEV)
+--- a/include/media/v4l2-mediabus.h
++++ b/include/media/v4l2-mediabus.h
+@@ -67,6 +67,14 @@
+ V4L2_MBUS_CSI2_CHANNEL_1 | \
+ V4L2_MBUS_CSI2_CHANNEL_2 | \
+ V4L2_MBUS_CSI2_CHANNEL_3)
++/*
++ * Number of lanes in use, 0 == use all available lanes (default)
++ *
++ * This is a temporary fix for devices that need to reduce the number of active
++ * lanes for certain modes, until g_mbus_config() can be replaced with a better
++ * solution.
++ */
++#define V4L2_MBUS_CSI2_LANE_MASK (0xf << 10)
+
+ /**
+ * enum v4l2_mbus_type - media bus type