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authorÁlvaro Fernández Rojas <noltari@gmail.com>2020-02-29 09:25:20 +0100
committerÁlvaro Fernández Rojas <noltari@gmail.com>2020-02-29 12:50:51 +0100
commita1383655cfaa71609d6236ae0fcf3b6047462b98 (patch)
treec6f123859e0dfcfaa6c1063eda26f27e208d3cac /target/linux/bcm27xx/patches-5.4/950-0290-Fixup-FKMS-interrupt-handing-for-non-existent-displa.patch
parenta8aa974a9dfb4cba484dc4c1e4207fd9ec803410 (diff)
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bcm27xx: add linux 5.4 support
Tested on bcm2710 (Raspberry Pi 3B). Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0290-Fixup-FKMS-interrupt-handing-for-non-existent-displa.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0290-Fixup-FKMS-interrupt-handing-for-non-existent-displa.patch39
1 files changed, 39 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0290-Fixup-FKMS-interrupt-handing-for-non-existent-displa.patch b/target/linux/bcm27xx/patches-5.4/950-0290-Fixup-FKMS-interrupt-handing-for-non-existent-displa.patch
new file mode 100644
index 0000000000..60c9c9b03f
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0290-Fixup-FKMS-interrupt-handing-for-non-existent-displa.patch
@@ -0,0 +1,39 @@
+From d6baa1bd90e7e68ac69d5378d70174ea67bf35dc Mon Sep 17 00:00:00 2001
+From: James Hughes <james.hughes@raspberrypi.org>
+Date: Mon, 29 Jul 2019 12:02:59 +0100
+Subject: [PATCH] Fixup FKMS interrupt handing for non-existent display
+
+If an errant interrupt flag was received from a non-existent display,
+a NULL pointer access was made. Protect against this by checking if a
+second display is present prior to checking the interrupt flags.
+---
+ drivers/gpu/drm/vc4/vc4_firmware_kms.c | 17 ++++++++++-------
+ 1 file changed, 10 insertions(+), 7 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
++++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
+@@ -1087,14 +1087,17 @@ static irqreturn_t vc4_crtc_irq_handler(
+ vc4_crtc_handle_page_flip(crtc_list[0]);
+ }
+
+- /* Check for the secondary display too */
+- chan = readl(crtc_list[0]->regs + SMIDSW1);
++ if (crtc_list[1]) {
++ /* Check for the secondary display too */
++ chan = readl(crtc_list[0]->regs + SMIDSW1);
+
+- if (chan & 1) {
+- writel(SMI_NEW, crtc_list[0]->regs + SMIDSW1);
+- if (crtc_list[1]->vblank_enabled)
+- drm_crtc_handle_vblank(&crtc_list[1]->base);
+- vc4_crtc_handle_page_flip(crtc_list[1]);
++ if (chan & 1) {
++ writel(SMI_NEW, crtc_list[0]->regs + SMIDSW1);
++
++ if (crtc_list[1]->vblank_enabled)
++ drm_crtc_handle_vblank(&crtc_list[1]->base);
++ vc4_crtc_handle_page_flip(crtc_list[1]);
++ }
+ }
+ }
+