[U-Boot] [PATCH v2 10/28] tegra: spi: Wait a little after setting the clocks

Simon Glass sjg at chromium.org
Wed May 31 23:57:18 UTC 2017


For devices that need a delay between SPI transactions we seem to need an
additional delay before the first one if the CPU is running at full speed.
Add this, under control of the existing setting. At present it will only
be enabled with the Chrome OS EC.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v2: None

 drivers/spi/tegra114_spi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/tegra114_spi.c b/drivers/spi/tegra114_spi.c
index 013bc82380..04b4fce061 100644
--- a/drivers/spi/tegra114_spi.c
+++ b/drivers/spi/tegra114_spi.c
@@ -149,6 +149,7 @@ static int tegra114_spi_probe(struct udevice *bus)
 			       bus->name, priv->freq, rate);
 		}
 	}
+	udelay(plat->deactivate_delay_us);
 
 	/* Clear stale status here */
 	setbits_le32(&regs->fifo_status,
-- 
2.13.0.219.gdb65acc882-goog



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