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.chot...@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);
--
1.9.1
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