diff mbox series

[v7,1/7] gpio: aspeed: Add the flush write to ensure the write complete.

Message ID 20241008081450.1490955-2-billy_tsai@aspeedtech.com
State New
Headers show
Series Add Aspeed G7 gpio support | expand

Commit Message

Billy Tsai Oct. 8, 2024, 8:14 a.m. UTC 
Performing a dummy read ensures that the register write operation is fully
completed, mitigating any potential bus delays that could otherwise impact
the frequency of bitbang usage. E.g., if the JTAG application uses GPIO to
control the JTAG pins (TCK, TMS, TDI, TDO, and TRST), and the application
sets the TCK clock to 1 MHz, the GPIO's high/low transitions will rely on
a delay function to ensure the clock frequency does not exceed 1 MHz.
However, this can lead to rapid toggling of the GPIO because the write
operation is POSTed and does not wait for a bus acknowledgment.

Fixes: 361b79119a4b ("gpio: Add Aspeed driver")
Reviewed-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
---
 drivers/gpio/gpio-aspeed.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c
index 04c03402db6d..98551b7f6de2 100644
--- a/drivers/gpio/gpio-aspeed.c
+++ b/drivers/gpio/gpio-aspeed.c
@@ -406,6 +406,8 @@  static void __aspeed_gpio_set(struct gpio_chip *gc, unsigned int offset,
 	gpio->dcache[GPIO_BANK(offset)] = reg;
 
 	iowrite32(reg, addr);
+	/* Flush write */
+	ioread32(addr);
 }
 
 static void aspeed_gpio_set(struct gpio_chip *gc, unsigned int offset,