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cci: Use dsb to wait before reading status register 

The CCI500 TRM explicitily requires completion of the write
operation before the read operation, and it is not guaranteed
by dmb but it is dsb.

Change-Id: Ieeaa0d1a4b8fcb87108dea9b6de03d9c8a150829
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
This commit is contained in:
Roberto Vargas 2018-08-13 14:17:43 +01:00
parent 6902e66a6b
commit fcb52dbf16
1 changed files with 2 additions and 2 deletions
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4
drivers/arm/cci/cci.c
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@ -147,7 +147,7 @@ void cci_enable_snoop_dvm_reqs(unsigned int master_id)
* Wait for the completion of the write to the Snoop Control Register
* before testing the change_pending bit
*/
dmbish();
dsbish();
/* Wait for the dust to settle down */
while (mmio_read_32(cci_base + STATUS_REG) & CHANGE_PENDING_BIT)
@ -174,7 +174,7 @@ void cci_disable_snoop_dvm_reqs(unsigned int master_id)
* Wait for the completion of the write to the Snoop Control Register
* before testing the change_pending bit
*/
dmbish();
dsbish();
/* Wait for the dust to settle down */
while (mmio_read_32(cci_base + STATUS_REG) & CHANGE_PENDING_BIT)