In some situation, QSPI controller is already configured by an early boot stage, adding reset support will insure that QSPI controller is started from a pristine state.
Signed-off-by: Patrice Chotard patrice.chotard@st.com ---
Changes in v2: None
drivers/spi/stm32_qspi.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/drivers/spi/stm32_qspi.c b/drivers/spi/stm32_qspi.c index 62875e2e4c89..f6cc35336320 100644 --- a/drivers/spi/stm32_qspi.c +++ b/drivers/spi/stm32_qspi.c @@ -12,6 +12,7 @@ #include <dm.h> #include <errno.h> #include <malloc.h> +#include <reset.h> #include <spi.h> #include <spi_flash.h> #include <asm/io.h> @@ -457,6 +458,7 @@ static int stm32_qspi_probe(struct udevice *bus) struct stm32_qspi_priv *priv = dev_get_priv(bus); struct dm_spi_bus *dm_spi_bus; struct clk clk; + struct reset_ctl reset_ctl; int ret;
dm_spi_bus = bus->uclass_priv; @@ -484,6 +486,19 @@ static int stm32_qspi_probe(struct udevice *bus) return priv->clock_rate; }
+ ret = reset_get_by_index(bus, 0, &reset_ctl); + if (ret) { + if (ret != -ENOENT) { + dev_err(bus, "failed to get reset\n"); + clk_disable(&clk); + return ret; + } + } else { + /* Reset QSPI controller */ + reset_assert(&reset_ctl); + udelay(2); + reset_deassert(&reset_ctl); + }
setbits_le32(&priv->regs->cr, STM32_QSPI_CR_SSHIFT);