[Qemu-devel] [PATCH arm-devs v4 09/15] xilinx_spips: lqspi: Dont touch config register

[peter . crosthwaite]

From: Peter Crosthwaite <address@hidden>

The LQSPI mode is supposed to work via the automatic CS mode feature
rather than manipulate CS lines itself. Now that auto CS is implemented
remove LQSPIs CS mode override logic. There is still a need to
manipulate the U_PAGE bit in LQSPI config register to implement
dual-stack mode however.

Signed-off-by: Peter Crosthwaite <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
Reviewed-by: Edgar E. Iglesias <address@hidden>
---
This patch in new as of v2

 hw/ssi/xilinx_spips.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/hw/ssi/xilinx_spips.c b/hw/ssi/xilinx_spips.c
index 631d010..ea8a593 100644
--- a/hw/ssi/xilinx_spips.c
+++ b/hw/ssi/xilinx_spips.c
@@ -511,16 +511,16 @@ lqspi_read(void *opaque, hwaddr addr, unsigned int size)
         int flash_addr = (addr / num_effective_busses(s));
         int slave = flash_addr >> LQSPI_ADDRESS_BITS;
         int cache_entry = 0;
+        uint32_t u_page_save = s->regs[R_LQSPI_STS] & ~LQSPI_CFG_U_PAGE;
+
+        s->regs[R_LQSPI_STS] &= ~LQSPI_CFG_U_PAGE;
+        s->regs[R_LQSPI_STS] |= slave ? LQSPI_CFG_U_PAGE : 0;
 
         DB_PRINT("config reg status: %08x\n", s->regs[R_LQSPI_CFG]);
 
         fifo8_reset(&s->tx_fifo);
         fifo8_reset(&s->rx_fifo);
 
-        s->regs[R_CONFIG] &= ~CS;
-        s->regs[R_CONFIG] |= ((~(1 << slave) << CS_SHIFT) & CS) | MANUAL_CS;
-        xilinx_spips_update_cs_lines(s);
-
         /* instruction */
         DB_PRINT("pushing read instruction: %02x\n",
                  (uint8_t)(s->regs[R_LQSPI_CFG] & LQSPI_CFG_INST_CODE));
@@ -554,9 +554,9 @@ lqspi_read(void *opaque, hwaddr addr, unsigned int size)
             rx_data_bytes(s, &q->lqspi_buf[cache_entry], 4);
             cache_entry++;
         }
-        xilinx_spips_update_cs_lines(s);
 
-        s->regs[R_CONFIG] |= CS;
+        s->regs[R_LQSPI_STS] &= ~LQSPI_CFG_U_PAGE;
+        s->regs[R_LQSPI_STS] |= u_page_save;
         xilinx_spips_update_cs_lines(s);
 
         q->lqspi_cached_addr = addr;
-- 
1.8.3.rc1.44.gb387c77.dirty