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Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0808-media-bcm2835-unicam-Always-service-interrupts.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0808-media-bcm2835-unicam-Always-service-interrupts.patch51
1 files changed, 51 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0808-media-bcm2835-unicam-Always-service-interrupts.patch b/target/linux/bcm27xx/patches-5.4/950-0808-media-bcm2835-unicam-Always-service-interrupts.patch
new file mode 100644
index 0000000000..371013fe60
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0808-media-bcm2835-unicam-Always-service-interrupts.patch
@@ -0,0 +1,51 @@
+From b493e2a03c1780ae1ba09a9de58474c17a33310d Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.com>
+Date: Wed, 13 May 2020 18:28:27 +0100
+Subject: [PATCH] media: bcm2835-unicam: Always service interrupts
+
+From when bringing up the driver, there was a check in the isr
+to ignore interrupts (claiming them handled) should the driver
+not be streaming.
+
+The VPU now will not register a camera driver if it finds a
+CSI2 node enabled in device tree, therefore this flawed check is
+redundant.
+
+https://github.com/raspberrypi/linux/issues/3602
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
+---
+ drivers/media/platform/bcm2835/bcm2835-unicam.c | 15 ---------------
+ 1 file changed, 15 deletions(-)
+
+--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
++++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
+@@ -772,12 +772,6 @@ static bool unicam_all_nodes_streaming(s
+ return ret;
+ }
+
+-static bool unicam_all_nodes_disabled(struct unicam_device *dev)
+-{
+- return !dev->node[IMAGE_PAD].streaming &&
+- !dev->node[METADATA_PAD].streaming;
+-}
+-
+ static void unicam_queue_event_sof(struct unicam_device *unicam)
+ {
+ struct v4l2_event event = {
+@@ -805,15 +799,6 @@ static irqreturn_t unicam_isr(int irq, v
+ u32 ista, sta;
+ u64 ts;
+
+- /*
+- * Don't service interrupts if not streaming.
+- * Avoids issues if the VPU should enable the
+- * peripheral without the kernel knowing (that
+- * shouldn't happen, but causes issues if it does).
+- */
+- if (unicam_all_nodes_disabled(unicam))
+- return IRQ_NONE;
+-
+ sta = reg_read(unicam, UNICAM_STA);
+ /* Write value back to clear the interrupts */
+ reg_write(unicam, UNICAM_STA, sta);