[Qemu-devel] [PATCH for-1.5 v2 14/15] xilinx_spips: lqspi: Push more data to tx-fifo

[peter . crosthwaite]

From: Peter Crosthwaite <address@hidden>

Do 16 words per fifo flush. Increases performance and decreases
debug verbosity. This data depth has no real hardware analogue,
so just go with something that has reasonable performance.

Signed-off-by: Peter Crosthwaite <address@hidden>
---

 hw/ssi/xilinx_spips.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/hw/ssi/xilinx_spips.c b/hw/ssi/xilinx_spips.c
index df55ca6..68434f0 100644
--- a/hw/ssi/xilinx_spips.c
+++ b/hw/ssi/xilinx_spips.c
@@ -609,11 +609,14 @@ lqspi_read(void *opaque, hwaddr addr, unsigned int size)
 
         DB_PRINT_L(0, "starting QSPI data read\n");
 
-        for (i = 0; i < LQSPI_CACHE_SIZE / 4; ++i) {
-            tx_data_bytes(s, 0, 4);
+        while (cache_entry < LQSPI_CACHE_SIZE / 4) {
+            for (i = 0; i < 16; ++i) {
+                tx_data_bytes(s, 0, 4);
+            }
             xilinx_spips_flush_txfifo(s);
-            rx_data_bytes(s, &q->lqspi_buf[cache_entry], 4);
-            cache_entry++;
+            for (i = 0; i < 16; ++i) {
+                rx_data_bytes(s, &q->lqspi_buf[cache_entry++], 4);
+            }
         }
 
         s->regs[R_LQSPI_STS] &= ~LQSPI_CFG_U_PAGE;
-- 
1.7.0.4