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fsi: master-ast-cf: Mask unused bits in RTAG/RCRC 

Then reading the RTAG/RCRC "registers" from the coprocessor after
a command is complete, mask out the top bits, only keep the relevant
bits. Microcode v5 will leave garbage in those top bits as a
result of a performance optimization.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
hifive-unleashed-5.1
Benjamin Herrenschmidt 2018-07-25 14:57:21 +10:00
parent d0cff240b8
commit 375cac7010
1 changed files with 2 additions and 2 deletions
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4
drivers/fsi/fsi-master-ast-cf.c
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@ -377,8 +377,8 @@ static int send_request(struct fsi_master_acf *master, struct fsi_msg *cmd,
static int read_copro_response(struct fsi_master_acf *master, uint8_t size,
uint32_t *response, u8 *tag)
{
uint8_t rtag = ioread8(master->sram + STAT_RTAG);
uint8_t rcrc = ioread8(master->sram + STAT_RCRC);
uint8_t rtag = ioread8(master->sram + STAT_RTAG) & 0xf;
uint8_t rcrc = ioread8(master->sram + STAT_RCRC) & 0xf;
uint32_t rdata = 0;
uint32_t crc;
uint8_t ack;