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crypto: ccp - Use lower 8 bytes to communicate with doorbell command register 

Unlike other command registers used by the PSP, only the lower 8 bytes are
used for communication for both command and status of the command.

Suggested-by: Mark Hasemeyer <markhas@chromium.org>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Mark Hasemeyer <markhas@chromium.org>
Tested-by: Mark Hasemeyer <markhas@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mario Limonciello 2023-04-03 13:32:13 -05:00 committed by Herbert Xu
parent a19c61b065
commit 6699e1431e
1 changed files with 3 additions and 2 deletions
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5
drivers/crypto/ccp/platform-access.c
View File

@ -19,6 +19,7 @@
#include "platform-access.h"
#define PSP_CMD_TIMEOUT_US (500 * USEC_PER_MSEC)
#define DOORBELL_CMDRESP_STS GENMASK(7, 0)
/* Recovery field should be equal 0 to start sending commands */
static int check_recovery(u32 __iomem *cmd)
@ -154,7 +155,7 @@ int psp_ring_platform_doorbell(int msg, u32 *result)
goto unlock;
}
iowrite32(FIELD_PREP(PSP_DRBL_MSG, msg), cmd);
iowrite32(FIELD_PREP(DOORBELL_CMDRESP_STS, msg), cmd);
iowrite32(PSP_DRBL_RING, button);
if (wait_cmd(cmd)) {
@ -162,7 +163,7 @@ int psp_ring_platform_doorbell(int msg, u32 *result)
goto unlock;
}
val = FIELD_GET(PSP_CMDRESP_STS, ioread32(cmd));
val = FIELD_GET(DOORBELL_CMDRESP_STS, ioread32(cmd));
if (val) {
if (result)
*result = val;