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cpus: denver: skip DCO enable/disable for recent SKUs

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DCO is not supported by the SKUs released after MIDR_PN4. This
patch skips enabling or disabling the DCO on these SKUs.

Change-Id: Ic31a829de3ae560314d0fb5c5e867689d4ba243b
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
This commit is contained in:
Varun Wadekar 2020-08-05 23:10:40 -07:00
parent 5a22eb421d
commit 5f902752e5
1 changed files with 14 additions and 4 deletions
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18
lib/cpus/aarch64/denver.S
View file

@ -161,13 +161,19 @@ endfunc denver_disable_ext_debug
* ----------------------------------------------------
*/
func denver_enable_dco
/* DCO is not supported on PN5 and later */
mrs x1, midr_el1
mov_imm x2, DENVER_MIDR_PN4
cmp x1, x2
b.hi 1f
mov x18, x30
bl plat_my_core_pos
mov x1, #1
lsl x1, x1, x0
msr s3_0_c15_c0_2, x1
mov x30, x18
ret
1: ret
endfunc denver_enable_dco
/* ----------------------------------------------------
@ -175,10 +181,14 @@ endfunc denver_enable_dco
* ----------------------------------------------------
*/
func denver_disable_dco
mov x18, x30
/* DCO is not supported on PN5 and later */
mrs x1, midr_el1
mov_imm x2, DENVER_MIDR_PN4
cmp x1, x2
b.hi 2f
/* turn off background work */
mov x18, x30
bl plat_my_core_pos
mov x1, #1
lsl x1, x1, x0
@ -194,7 +204,7 @@ func denver_disable_dco
cbnz x2, 1b
mov x30, x18
ret
2: ret
endfunc denver_disable_dco
func check_errata_cve_2017_5715