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fix(cpus): workaround for Cortex-A710 erratum 2291219

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Cortex-A710 erratum 2291219 is a Cat B erratum that applies to revisions
r0p0, r1p0, and r2p0, and is fixed in r2p1. The workaround is to set
CPUACTLR2_EL1[36] to 1 before the power down sequence that sets
CORE_PWRDN_EN. This allows the cpu to retry the power down and prevents
the deadlock. TF-A never clears this bit even if it wakes up from the
wfi in the sequence since it is not expected to do anything but retry to
power down after and the bit is cleared on reset.

SDEN can be found here:
https://developer.arm.com/documentation/SDEN1775101/latest

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I7d3a97dfac0c433c0be386c1f3d2f2e895a3f691
This commit is contained in:
Boyan Karatotev 2022-10-03 14:21:28 +01:00
parent 7954412694
commit 888eafa00b
4 changed files with 49 additions and 0 deletions
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4
docs/design/cpu-specific-build-macros.rst
View file

@ -495,6 +495,10 @@ For Cortex-A710, the following errata build flags are defined :
Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
of the CPU and is fixed in r2p1.
- ``ERRATA_A710_2291219``: This applies errata 2291219 workaround to
Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
of the CPU and is fixed in r2p1.
- ``ERRATA_A710_2008768``: This applies errata 2008768 workaround to
Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
of the CPU and is fixed in r2p1.

1
include/lib/cpus/aarch64/cortex_a710.h
View file

@ -36,6 +36,7 @@
******************************************************************************/
#define CORTEX_A710_CPUACTLR2_EL1 S3_0_C15_C1_1
#define CORTEX_A710_CPUACTLR2_EL1_BIT_40 (ULL(1) << 40)
#define CORTEX_A710_CPUACTLR2_EL1_BIT_36 (ULL(1) << 36)
/*******************************************************************************
* CPU Auxiliary Control register 5 specific definitions.

36
lib/cpus/aarch64/cortex_a710.S
View file

@ -383,6 +383,34 @@ func check_errata_2282622
b cpu_rev_var_ls
endfunc check_errata_2282622
/* ------------------------------------------------------------------------
* Errata Workaround for Cortex-A710 Erratum 2291219 on power down request.
* This applies to revision <= r2p0 and is fixed in r2p1.
* Inputs:
* x0: variant[4:7] and revision[0:3] of current cpu.
* Shall clobber: x0-x1, x17
* ------------------------------------------------------------------------
*/
func errata_a710_2291219_wa
/* Check revision. */
mov x17, x30
bl check_errata_2291219
cbz x0, 1f
/* Set bit 36 in ACTLR2_EL1 */
mrs x1, CORTEX_A710_CPUACTLR2_EL1
orr x1, x1, #CORTEX_A710_CPUACTLR2_EL1_BIT_36
msr CORTEX_A710_CPUACTLR2_EL1, x1
1:
ret x17
endfunc errata_a710_2291219_wa
func check_errata_2291219
/* Applies to <= r2p0. */
mov x1, #0x20
b cpu_rev_var_ls
endfunc check_errata_2291219
/* ---------------------------------------------------------------
* Errata Workaround for Cortex-A710 Erratum 2008768.
* This applies to revision r0p0, r1p0 and r2p0.
@ -476,6 +504,13 @@ func cortex_a710_core_pwr_dwn
mov x30, x4
#endif
#if ERRATA_A710_2291219
mov x15, x30
bl cpu_get_rev_var
bl errata_a710_2291219_wa
mov x30, x15
#endif /* ERRATA_A710_2291219 */
/* ---------------------------------------------------
* Enable CPU power down bit in power control register
* ---------------------------------------------------
@ -513,6 +548,7 @@ func cortex_a710_errata_report
report_errata ERRATA_A710_2008768, cortex_a710, 2008768
report_errata ERRATA_A710_2147715, cortex_a710, 2147715
report_errata ERRATA_A710_2216384, cortex_a710, 2216384
report_errata ERRATA_A710_2291219, cortex_a710, 2291219
report_errata ERRATA_A710_2371105, cortex_a710, 2371105
report_errata WORKAROUND_CVE_2022_23960, cortex_a710, cve_2022_23960
report_errata ERRATA_DSU_2313941, cortex_a710, dsu_2313941

8
lib/cpus/cpu-ops.mk
View file

@ -548,6 +548,10 @@ ERRATA_A710_2216384 ?=0
# to revision r0p0, r1p0 and r2p0 of the Cortex-A710 cpu and is fixed in r2p1.
ERRATA_A710_2282622 ?=0
# Flag to apply erratum 2291219 workaround during reset. This erratum applies
# to revision r0p0, r1p0 and r2p0 of the Cortex-A710 cpu and is fixed in r2p1.
ERRATA_A710_2291219 ?=0
# Flag to apply erratum 2008768 workaround during reset. This erratum applies
# to revision r0p0, r1p0 and r2p0 of the Cortex-A710 cpu and is fixed in r2p1.
ERRATA_A710_2008768 ?=0
@ -1164,6 +1168,10 @@ $(eval $(call add_define,ERRATA_A710_2216384))
$(eval $(call assert_boolean,ERRATA_A710_2282622))
$(eval $(call add_define,ERRATA_A710_2282622))
# Process ERRATA_A710_2291219 flag
$(eval $(call assert_boolean,ERRATA_A710_2291219))
$(eval $(call add_define,ERRATA_A710_2291219))
# Process ERRATA_A710_2008768 flag
$(eval $(call assert_boolean,ERRATA_A710_2008768))
$(eval $(call add_define,ERRATA_A710_2008768))