[PATCH v7 4/6] spi: rockchip: Wait for STB status in slave mode tx_xfer

Jon Lin
2021-06-15T17:39:39Z

After ROCKCHIP_SPI_VER2_TYPE2, SR->STB is a more accurate judgment
bit for spi slave transmition.

Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
---

Changes in v7: None
Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None

drivers/spi/spi-rockchip.c | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 0887b19ef3ad..950d3bce443b 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -116,13 +116,14 @@
#define BAUDR_SCKDV_MIN 2
#define BAUDR_SCKDV_MAX 65534

-/* Bit fields in SR, 5bit */
-#define SR_MASK 0x1f
+/* Bit fields in SR, 6bit */
+#define SR_MASK 0x3f
#define SR_BUSY (1 << 0)
#define SR_TF_FULL (1 << 1)
#define SR_TF_EMPTY (1 << 2)
#define SR_RF_EMPTY (1 << 3)
#define SR_RF_FULL (1 << 4)
+#define SR_SLAVE_TX_BUSY (1 << 5)

/* Bit fields in ISR, IMR, ISR, RISR, 5bit */
#define INT_MASK 0x1f
@@ -197,13 +198,19 @@ static inline void spi_enable_chip(struct rockchip_spi *rs, bool enable)
writel_relaxed((enable ? 1U : 0U), rs->regs + ROCKCHIP_SPI_SSIENR);
}

-static inline void wait_for_idle(struct rockchip_spi *rs)
+static inline void wait_for_tx_idle(struct rockchip_spi *rs, bool slave_mode)
{
unsigned long timeout = jiffies + msecs_to_jiffies(5);

do {
- if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
- return;
+ if (slave_mode) {
+ if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_SLAVE_TX_BUSY) &&
+ !((readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY)))
+ return;
+ } else {
+ if (!(readl_relaxed(rs->regs + ROCKCHIP_SPI_SR) & SR_BUSY))
+ return;
+ }
} while (!time_after(jiffies, timeout));

dev_warn(rs->dev, "spi controller is in busy state!\n");
@@ -383,7 +390,7 @@ static void rockchip_spi_dma_txcb(void *data)
return;

/* Wait until the FIFO data completely. */
- wait_for_idle(rs);
+ wait_for_tx_idle(rs, ctlr->slave);

spi_enable_chip(rs, false);
spi_finalize_current_transfer(ctlr);
@@ -545,7 +552,7 @@ static int rockchip_spi_config(struct rockchip_spi *rs,
else
writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_RXFTLR);

- writel_relaxed(rs->fifo_len / 2, rs->regs + ROCKCHIP_SPI_DMATDLR);
+ writel_relaxed(rs->fifo_len / 2 - 1, rs->regs + ROCKCHIP_SPI_DMATDLR);
writel_relaxed(rockchip_spi_calc_burst_size(xfer->len / rs->n_bytes) - 1,
rs->regs + ROCKCHIP_SPI_DMARDLR);
writel_relaxed(dmacr, rs->regs + ROCKCHIP_SPI_DMACR);