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FROMLIST: spi: rockchip: Wait for STB status in slave mode tx_xfer

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

Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
Link: https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210615033213.14241-5-jon.lin@rock-chips.com/
Change-Id: I39fe2b9e5a84304e7d0320842399a02a4b0743a0
This commit is contained in:
Jon Lin
2021-06-15 11:32:11 +08:00
committed by Tao Huang
parent 1458738a72
commit c434048c2e
1 changed files with 14 additions and 7 deletions
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21
drivers/spi/spi-rockchip.c
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@@ -117,13 +117,14 @@
#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
@@ -199,13 +200,19 @@ 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");
@@ -385,7 +392,7 @@ 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);
@@ -558,7 +565,7 @@ static void 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);