ti: k3: common: Remove coherency workaround for AM65x

We previously left our caches on during power-down to prevent any
non-caching accesses to memory that is cached by other cores. Now with
the last accessed areas all being marked as non-cached by
USE_COHERENT_MEM we can rely on that to workaround our interconnect
issues. Remove the old workaround.

Change-Id: Idadb7696d1449499d1edff4f6f62ab3b99d1efb7
Signed-off-by: Andrew F. Davis <afd@ti.com>

lib/cpus/aarch64/cortex_a53.S

@@ -279,13 +279,11 @@ endfunc cortex_a53_reset_func
 func cortex_a53_core_pwr_dwn
 	mov	x18, x30
 
-#if !TI_AM65X_WORKAROUND
 	/* ---------------------------------------------
 	 * Turn off caches.
 	 * ---------------------------------------------
 	 */
 	bl	cortex_a53_disable_dcache
-#endif
 
 	/* ---------------------------------------------
 	 * Flush L1 caches.
@@ -305,13 +303,11 @@ endfunc cortex_a53_core_pwr_dwn
 func cortex_a53_cluster_pwr_dwn
 	mov	x18, x30
 
-#if !TI_AM65X_WORKAROUND
 	/* ---------------------------------------------
 	 * Turn off caches.
 	 * ---------------------------------------------
 	 */
 	bl	cortex_a53_disable_dcache
-#endif
 
 	/* ---------------------------------------------
 	 * Flush L1 caches.

plat/ti/k3/common/k3_psci.c

@@ -17,11 +17,6 @@
 #include <k3_gicv3.h>
 #include <ti_sci.h>
 
-#ifdef TI_AM65X_WORKAROUND
-/* Need to flush psci internal locks before shutdown or their values are lost */
-#include "../../../../lib/psci/psci_private.h"
-#endif
-
 uintptr_t k3_sec_entrypoint;
 
 static void k3_cpu_standby(plat_local_state_t cpu_state)
@@ -115,16 +110,6 @@ void k3_pwr_domain_on_finish(const psci_power_state_t *target_state)
 	k3_gic_cpuif_enable();
 }
 
-#ifdef TI_AM65X_WORKAROUND
-static void  __dead2 k3_pwr_domain_pwr_down_wfi(const psci_power_state_t
-						  *target_state)
-{
-	flush_cpu_data(psci_svc_cpu_data);
-	flush_dcache_range((uintptr_t) psci_locks, sizeof(psci_locks));
-	psci_power_down_wfi();
-}
-#endif
-
 static void __dead2 k3_system_reset(void)
 {
 	/* Send the system reset request to system firmware */
@@ -154,9 +139,6 @@ static const plat_psci_ops_t k3_plat_psci_ops = {
 	.pwr_domain_on = k3_pwr_domain_on,
 	.pwr_domain_off = k3_pwr_domain_off,
 	.pwr_domain_on_finish = k3_pwr_domain_on_finish,
-#ifdef TI_AM65X_WORKAROUND
-	.pwr_domain_pwr_down_wfi = k3_pwr_domain_pwr_down_wfi,
-#endif
 	.system_reset = k3_system_reset,
 	.validate_power_state = k3_validate_power_state,
 	.validate_ns_entrypoint = k3_validate_ns_entrypoint

plat/ti/k3/common/plat_common.mk

@@ -28,10 +28,6 @@ ERRATA_A72_859971	:=	1
 # Split out RO data into a non-executable section
 SEPARATE_CODE_AND_RODATA :=    1
 
-# Leave the caches enabled on core powerdown path
-TI_AM65X_WORKAROUND	:=	1
-$(eval $(call add_define,TI_AM65X_WORKAROUND))
-
 MULTI_CONSOLE_API	:=	1
 TI_16550_MDR_QUIRK	:=	1
 $(eval $(call add_define,TI_16550_MDR_QUIRK))