On Fri, Jul 09, 2021 at 12:38:07PM +0100, Jon Hunter wrote:

On 09/07/2021 09:34, Jon Hunter wrote:

quoted

On 08/07/2021 23:25, Michał Mirosław wrote:

quoted

On Wed, Jun 30, 2021 at 01:56:43PM +0100, Jon Hunter wrote:

quoted

The Tegra serial driver always prints an error message when enabling the
FIFO for devices that have support for checking the FIFO enable status.
Fix this by displaying the error message, only when an error occurs.

Finally, update the error message to make it clear that enabling the
FIFO failed and display the error code.

[...]

quoted

@@ -1045,9 +1045,11 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup)
 
 	if (tup->cdata->fifo_mode_enable_status) {
 		ret = tegra_uart_wait_fifo_mode_enabled(tup);
-		dev_err(tup->uport.dev, "FIFO mode not enabled\n");
-		if (ret < 0)
+		if (ret < 0) {
+			dev_err(tup->uport.dev,
+				"Failed to enable FIFO mode: %d\n", ret);

Could you change this to use %pe and ERR_PTR(ret)?

Sorry, but it is not clear to me why this would be necessary in this case.

I see so '%pe' prints the symbolic name of the error code. While that is
nice, it also looks a bit odd. Given that we simply print the error code
values in this driver, from looking at other prints, I prefer to keep it
as is for consistency.

It is a quite new facility of printk(), so I woudn't expect it to be
present in older code. It saves a bit of time when you occasionally
hit an error, so even incremental conversion seems beneficial for me.

Best Regards
Michał Mirosław