Commit aa099382 authored by Jeffy Chen's avatar Jeffy Chen Committed by Mark Brown

spi: rockchip: Disable Runtime PM when chip select is asserted

The rockchip spi would stop driving pins when runtime suspended, which
might break slave's xfer(for example cros_ec).

Since we have pullups on those pins, we only need to care about this
when the CS asserted.

So let's keep the spi alive when chip select is asserted.

Also use pm_runtime_put instead of pm_runtime_put_sync.
Suggested-by: default avatarDoug Anderson <dianders@chromium.org>
Signed-off-by: default avatarJeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: default avatarDouglas Anderson <dianders@chromium.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent c863795c
...@@ -25,6 +25,11 @@ ...@@ -25,6 +25,11 @@
#define DRIVER_NAME "rockchip-spi" #define DRIVER_NAME "rockchip-spi"
#define ROCKCHIP_SPI_CLR_BITS(reg, bits) \
writel_relaxed(readl_relaxed(reg) & ~(bits), reg)
#define ROCKCHIP_SPI_SET_BITS(reg, bits) \
writel_relaxed(readl_relaxed(reg) | (bits), reg)
/* SPI register offsets */ /* SPI register offsets */
#define ROCKCHIP_SPI_CTRLR0 0x0000 #define ROCKCHIP_SPI_CTRLR0 0x0000
#define ROCKCHIP_SPI_CTRLR1 0x0004 #define ROCKCHIP_SPI_CTRLR1 0x0004
...@@ -149,6 +154,8 @@ ...@@ -149,6 +154,8 @@
*/ */
#define ROCKCHIP_SPI_MAX_TRANLEN 0xffff #define ROCKCHIP_SPI_MAX_TRANLEN 0xffff
#define ROCKCHIP_SPI_MAX_CS_NUM 2
enum rockchip_ssi_type { enum rockchip_ssi_type {
SSI_MOTO_SPI = 0, SSI_MOTO_SPI = 0,
SSI_TI_SSP, SSI_TI_SSP,
...@@ -193,6 +200,8 @@ struct rockchip_spi { ...@@ -193,6 +200,8 @@ struct rockchip_spi {
/* protect state */ /* protect state */
spinlock_t lock; spinlock_t lock;
bool cs_asserted[ROCKCHIP_SPI_MAX_CS_NUM];
u32 use_dma; u32 use_dma;
struct sg_table tx_sg; struct sg_table tx_sg;
struct sg_table rx_sg; struct sg_table rx_sg;
...@@ -264,37 +273,29 @@ static inline u32 rx_max(struct rockchip_spi *rs) ...@@ -264,37 +273,29 @@ static inline u32 rx_max(struct rockchip_spi *rs)
static void rockchip_spi_set_cs(struct spi_device *spi, bool enable) static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
{ {
u32 ser;
struct spi_master *master = spi->master; struct spi_master *master = spi->master;
struct rockchip_spi *rs = spi_master_get_devdata(master); struct rockchip_spi *rs = spi_master_get_devdata(master);
bool cs_asserted = !enable;
pm_runtime_get_sync(rs->dev); /* Return immediately for no-op */
if (cs_asserted == rs->cs_asserted[spi->chip_select])
return;
ser = readl_relaxed(rs->regs + ROCKCHIP_SPI_SER) & SER_MASK; if (cs_asserted) {
/* Keep things powered as long as CS is asserted */
pm_runtime_get_sync(rs->dev);
/* ROCKCHIP_SPI_SET_BITS(rs->regs + ROCKCHIP_SPI_SER,
* drivers/spi/spi.c: BIT(spi->chip_select));
* static void spi_set_cs(struct spi_device *spi, bool enable) } else {
* { ROCKCHIP_SPI_CLR_BITS(rs->regs + ROCKCHIP_SPI_SER,
* if (spi->mode & SPI_CS_HIGH) BIT(spi->chip_select));
* enable = !enable;
*
* if (spi->cs_gpio >= 0)
* gpio_set_value(spi->cs_gpio, !enable);
* else if (spi->master->set_cs)
* spi->master->set_cs(spi, !enable);
* }
*
* Note: enable(rockchip_spi_set_cs) = !enable(spi_set_cs)
*/
if (!enable)
ser |= 1 << spi->chip_select;
else
ser &= ~(1 << spi->chip_select);
writel_relaxed(ser, rs->regs + ROCKCHIP_SPI_SER); /* Drop reference from when we first asserted CS */
pm_runtime_put(rs->dev);
}
pm_runtime_put_sync(rs->dev); rs->cs_asserted[spi->chip_select] = cs_asserted;
} }
static int rockchip_spi_prepare_message(struct spi_master *master, static int rockchip_spi_prepare_message(struct spi_master *master,
...@@ -739,7 +740,7 @@ static int rockchip_spi_probe(struct platform_device *pdev) ...@@ -739,7 +740,7 @@ static int rockchip_spi_probe(struct platform_device *pdev)
master->auto_runtime_pm = true; master->auto_runtime_pm = true;
master->bus_num = pdev->id; master->bus_num = pdev->id;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP; master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LOOP;
master->num_chipselect = 2; master->num_chipselect = ROCKCHIP_SPI_MAX_CS_NUM;
master->dev.of_node = pdev->dev.of_node; master->dev.of_node = pdev->dev.of_node;
master->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8); master->bits_per_word_mask = SPI_BPW_MASK(16) | SPI_BPW_MASK(8);
......
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