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authorSerge Semin <Sergey.Semin@baikalelectronics.ru>2020-10-08 02:55:05 +0300
committerMark Brown <broonie@kernel.org>2020-10-08 23:00:18 +0100
commitbf64b66036eef7d5a92fb1cb7398ef67a29fc64b (patch)
tree71f388cd806454ff5566b144b12e390beba94771 /drivers/spi
parentcf75baeac72c7cb57a8cf781e90cfd8ea77f2d51 (diff)
spi: dw: Add generic DW SSI status-check method
The DW SSI errors handling method can be generically implemented for all types of the transfers: IRQ, DMA and poll-based ones. It will be a function which checks the overflow/underflow error flags and resets the controller if any of them is set. In the framework of this commit we make use of the new method to detect the errors in the IRQ- and DMA-based SPI transfer execution procedures. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Link: https://lore.kernel.org/r/20201007235511.4935-17-Sergey.Semin@baikalelectronics.ru Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-dw-core.c43
-rw-r--r--drivers/spi/spi-dw-dma.c11
-rw-r--r--drivers/spi/spi-dw.h1
3 files changed, 37 insertions, 18 deletions
diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index 76e323db170f..8480da49a6a1 100644
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -169,23 +169,48 @@ static void dw_reader(struct dw_spi *dws)
}
}
-static void int_error_stop(struct dw_spi *dws, const char *msg)
+int dw_spi_check_status(struct dw_spi *dws, bool raw)
{
- spi_reset_chip(dws);
+ u32 irq_status;
+ int ret = 0;
+
+ if (raw)
+ irq_status = dw_readl(dws, DW_SPI_RISR);
+ else
+ irq_status = dw_readl(dws, DW_SPI_ISR);
+
+ if (irq_status & SPI_INT_RXOI) {
+ dev_err(&dws->master->dev, "RX FIFO overflow detected\n");
+ ret = -EIO;
+ }
+
+ if (irq_status & SPI_INT_RXUI) {
+ dev_err(&dws->master->dev, "RX FIFO underflow detected\n");
+ ret = -EIO;
+ }
- dev_err(&dws->master->dev, "%s\n", msg);
- dws->master->cur_msg->status = -EIO;
- spi_finalize_current_transfer(dws->master);
+ if (irq_status & SPI_INT_TXOI) {
+ dev_err(&dws->master->dev, "TX FIFO overflow detected\n");
+ ret = -EIO;
+ }
+
+ /* Generically handle the erroneous situation */
+ if (ret) {
+ spi_reset_chip(dws);
+ if (dws->master->cur_msg)
+ dws->master->cur_msg->status = ret;
+ }
+
+ return ret;
}
+EXPORT_SYMBOL_GPL(dw_spi_check_status);
static irqreturn_t dw_spi_transfer_handler(struct dw_spi *dws)
{
u16 irq_status = dw_readl(dws, DW_SPI_ISR);
- /* Error handling */
- if (irq_status & (SPI_INT_TXOI | SPI_INT_RXOI | SPI_INT_RXUI)) {
- dw_readl(dws, DW_SPI_ICR);
- int_error_stop(dws, "interrupt_transfer: fifo overrun/underrun");
+ if (dw_spi_check_status(dws, false)) {
+ spi_finalize_current_transfer(dws->master);
return IRQ_HANDLED;
}
diff --git a/drivers/spi/spi-dw-dma.c b/drivers/spi/spi-dw-dma.c
index 67539b847667..a09831c62192 100644
--- a/drivers/spi/spi-dw-dma.c
+++ b/drivers/spi/spi-dw-dma.c
@@ -176,17 +176,10 @@ static void dw_spi_dma_exit(struct dw_spi *dws)
static irqreturn_t dw_spi_dma_transfer_handler(struct dw_spi *dws)
{
- u16 irq_status = dw_readl(dws, DW_SPI_ISR);
+ dw_spi_check_status(dws, false);
- if (!irq_status)
- return IRQ_NONE;
-
- dw_readl(dws, DW_SPI_ICR);
- spi_reset_chip(dws);
-
- dev_err(&dws->master->dev, "%s: FIFO overrun/underrun\n", __func__);
- dws->master->cur_msg->status = -EIO;
complete(&dws->dma_completion);
+
return IRQ_HANDLED;
}
diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h
index fd4534f7de3d..7f26e46b1f87 100644
--- a/drivers/spi/spi-dw.h
+++ b/drivers/spi/spi-dw.h
@@ -262,6 +262,7 @@ static inline void spi_shutdown_chip(struct dw_spi *dws)
extern void dw_spi_set_cs(struct spi_device *spi, bool enable);
extern void dw_spi_update_config(struct dw_spi *dws, struct spi_device *spi,
struct dw_spi_cfg *cfg);
+extern int dw_spi_check_status(struct dw_spi *dws, bool raw);
extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws);
extern void dw_spi_remove_host(struct dw_spi *dws);
extern int dw_spi_suspend_host(struct dw_spi *dws);