bcm27xx: remove linux 4.19 support

[openwrt/staging/luka.git] / target / linux / bcm27xx / patches-4.19 / 950-0789-dwc_otg-fiq_fsm-add-a-barrier-on-entry-into-FIQ-hand.patch

diff --git a/target/linux/bcm27xx/patches-4.19/950-0789-dwc_otg-fiq_fsm-add-a-barrier-on-entry-into-FIQ-hand.patch b/target/linux/bcm27xx/patches-4.19/950-0789-dwc_otg-fiq_fsm-add-a-barrier-on-entry-into-FIQ-hand.patch
deleted file mode 100644 (file)
index dc48605..0000000
--- a/target/linux/bcm27xx/patches-4.19/950-0789-dwc_otg-fiq_fsm-add-a-barrier-on-entry-into-FIQ-hand.patch
+++ /dev/null
@@ -1,49 +0,0 @@
-From b2d43d61a1d6d070664f10d12b3c8b6df11eb21d Mon Sep 17 00:00:00 2001
-From: Jonathan Bell <jonathan@raspberrypi.org>
-Date: Mon, 13 Jan 2020 15:54:55 +0000
-Subject: [PATCH] dwc_otg: fiq_fsm: add a barrier on entry into FIQ
- handler(s)
-
-On BCM2835, there is no hardware guarantee that multiple outstanding
-reads to different peripherals will complete in-order. The FIQ code
-uses peripheral reads without barriers for performance, so in the case
-where a read to a slow peripheral was issued immediately prior to FIQ
-entry, the first peripheral read that the FIQ did could end up with
-wrong read data returned.
-
-Add dsb(sy) on entry so that all outstanding reads are retired.
-
-The FIQ only issues reads to the dwc_otg core, so per-read barriers
-in the handler itself are not required.
-
-On BCM2836 and BCM2837 the barrier is not strictly required due to
-differences in how the peripheral bus is implemented, but having
-arch-specific handlers that introduce different latencies is risky.
-
-Signed-off-by: Jonathan Bell <jonathan@raspberrypi.org>
----
- drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c | 6 ++++++
- 1 file changed, 6 insertions(+)
-
---- a/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c
-+++ b/drivers/usb/host/dwc_otg/dwc_otg_fiq_fsm.c
-@@ -1259,6 +1259,9 @@ void notrace dwc_otg_fiq_fsm(struct fiq_
-       haintmsk_data_t haintmsk;
-       int kick_irq = 0;
- 
-+      /* Ensure peripheral reads issued prior to FIQ entry are complete */
-+      dsb(sy);
-+
-       gintsts_handled.d32 = 0;
-       haint_handled.d32 = 0;
- 
-@@ -1379,6 +1382,9 @@ void notrace dwc_otg_fiq_nop(struct fiq_
-       gintmsk_data_t gintmsk;
-       hfnum_data_t hfnum;
- 
-+      /* Ensure peripheral reads issued prior to FIQ entry are complete */
-+      dsb(sy);
-+
-       fiq_fsm_spin_lock(&state->lock);
-       hfnum.d32 = FIQ_READ(state->dwc_regs_base + HFNUM);
-       gintsts.d32 = FIQ_READ(state->dwc_regs_base + GINTSTS);