This is a note to let you know that I've just added the patch titled
drm/mipi-dsi: Create devm device attachment
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-mipi-dsi-create-devm-device-attachment.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 48507e6d11abce4b0ad9519d5bd9dfc0518d4e68
Author: Maxime Ripard <mripard@xxxxxxxxxx>
Date: Fri Sep 10 12:11:58 2021 +0200
drm/mipi-dsi: Create devm device attachment
[ Upstream commit db6568498b35a4d5d5a99420df27ed25fae31406 ]
MIPI-DSI devices need to call mipi_dsi_attach() when their probe is done
to attach against their host.
However, at removal or when an error occurs, that attachment needs to be
undone through a call to mipi_dsi_detach().
Let's create a device-managed variant of the attachment function that
will automatically detach the device at unbind.
Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20210910101218.1632297-5-maxime@xxxxxxxxxx
Stable-dep-of: 941882a0e96d ("drm/bridge: lt8912b: Fix bridge_detach")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index bedbbfeab2a98..d98b08c65db93 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -392,6 +392,41 @@ int mipi_dsi_detach(struct mipi_dsi_device *dsi)
}
EXPORT_SYMBOL(mipi_dsi_detach);
+static void devm_mipi_dsi_detach(void *arg)
+{
+ struct mipi_dsi_device *dsi = arg;
+
+ mipi_dsi_detach(dsi);
+}
+
+/**
+ * devm_mipi_dsi_attach - Attach a MIPI-DSI device to its DSI Host
+ * @dev: device to tie the MIPI-DSI device attachment lifetime to
+ * @dsi: DSI peripheral
+ *
+ * This is the managed version of mipi_dsi_attach() which automatically
+ * calls mipi_dsi_detach() when @dev is unbound.
+ *
+ * Returns:
+ * 0 on success, a negative error code on failure.
+ */
+int devm_mipi_dsi_attach(struct device *dev,
+ struct mipi_dsi_device *dsi)
+{
+ int ret;
+
+ ret = mipi_dsi_attach(dsi);
+ if (ret)
+ return ret;
+
+ ret = devm_add_action_or_reset(dev, devm_mipi_dsi_detach, dsi);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_mipi_dsi_attach);
+
static ssize_t mipi_dsi_device_transfer(struct mipi_dsi_device *dsi,
struct mipi_dsi_msg *msg)
{
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 5105464052704..d9af72024d66d 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -233,6 +233,7 @@ devm_mipi_dsi_device_register_full(struct device *dev, struct mipi_dsi_host *hos
struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
int mipi_dsi_attach(struct mipi_dsi_device *dsi);
int mipi_dsi_detach(struct mipi_dsi_device *dsi);
+int devm_mipi_dsi_attach(struct device *dev, struct mipi_dsi_device *dsi);
int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi);
int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
