command2 = tspi->command2_reg;
command2 &= ~(SLINK_RXEN | SLINK_TXEN);
- tegra_slink_writel(tspi, command, SLINK_COMMAND);
- tspi->command_reg = command;
-
tspi->cur_direction = 0;
if (t->rx_buf) {
command2 |= SLINK_RXEN;
command2 |= SLINK_TXEN;
tspi->cur_direction |= DATA_DIR_TX;
}
+
+ /*
+ * Writing to the command2 register bevore the command register prevents
+ * a spike in chip_select line 0. This selects the chip_select line
+ * before changing the chip_select value.
+ */
tegra_slink_writel(tspi, command2, SLINK_COMMAND2);
tspi->command2_reg = command2;
+ tegra_slink_writel(tspi, command, SLINK_COMMAND);
+ tspi->command_reg = command;
+
if (total_fifo_words > SLINK_FIFO_DEPTH)
ret = tegra_slink_start_dma_based_transfer(tspi, t);
else