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>

diff --git a/drivers/crypto/ccp/platform-access.c b/drivers/crypto/ccp/platform-access.c
index 48f59ae..939c924 100644 (file)
--- a/drivers/crypto/ccp/platform-access.c
+++ b/drivers/crypto/ccp/platform-access.c
@@ -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;