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ssi: xilinx_spips: Skip spi bus update for a few register writes 

A few configuration register writes need not update the spi bus state, so just
return after the register write.

Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Francisco Iglesias <frasse.iglesias@gmail.com>
Tested-by: Francisco Iglesias <frasse.iglesias@gmail.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 1573830705-14579-1-git-send-email-sai.pavan.boddu@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Sai Pavan Boddu 2019-11-19 13:20:27 +00:00 committed by Peter Maydell
parent 6e553f2a1b
commit 3a6606c7aa
1 changed files with 18 additions and 4 deletions
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22
hw/ssi/xilinx_spips.c
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@ -109,6 +109,7 @@
#define R_GPIO (0x30 / 4)
#define R_LPBK_DLY_ADJ (0x38 / 4)
#define R_LPBK_DLY_ADJ_RESET (0x33)
#define R_IOU_TAPDLY_BYPASS (0x3C / 4)
#define R_TXD1 (0x80 / 4)
#define R_TXD2 (0x84 / 4)
#define R_TXD3 (0x88 / 4)
@ -139,6 +140,8 @@
#define R_LQSPI_STS (0xA4 / 4)
#define LQSPI_STS_WR_RECVD (1 << 1)
#define R_DUMMY_CYCLE_EN (0xC8 / 4)
#define R_ECO (0xF8 / 4)
#define R_MOD_ID (0xFC / 4)
#define R_GQSPI_SELECT (0x144 / 4)
@ -970,6 +973,7 @@ static void xilinx_spips_write(void *opaque, hwaddr addr,
{
int mask = ~0;
XilinxSPIPS *s = opaque;
bool try_flush = true;
DB_PRINT_L(0, "addr=" TARGET_FMT_plx " = %x\n", addr, (unsigned)value);
addr >>= 2;
@ -1019,13 +1023,23 @@ static void xilinx_spips_write(void *opaque, hwaddr addr,
tx_data_bytes(&s->tx_fifo, (uint32_t)value, 3,
s->regs[R_CONFIG] & R_CONFIG_ENDIAN);
goto no_reg_update;
/* Skip SPI bus update for below registers writes */
case R_GPIO:
case R_LPBK_DLY_ADJ:
case R_IOU_TAPDLY_BYPASS:
case R_DUMMY_CYCLE_EN:
case R_ECO:
try_flush = false;
break;
}
s->regs[addr] = (s->regs[addr] & ~mask) | (value & mask);
no_reg_update:
xilinx_spips_update_cs_lines(s);
xilinx_spips_check_flush(s);
xilinx_spips_update_cs_lines(s);
xilinx_spips_update_ixr(s);
if (try_flush) {
xilinx_spips_update_cs_lines(s);
xilinx_spips_check_flush(s);
xilinx_spips_update_cs_lines(s);
xilinx_spips_update_ixr(s);
}
}
static const MemoryRegionOps spips_ops = {