bianbu-repo-mirror/bianbu-linux-6.6
1
0
Fork 0
mirror of https://gitee.com/bianbu-linux/linux-6.6 synced 2025-06-29 23:43:21 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

pinctrl: aspeed: Force to disable the function's signal

Browse source 
When the driver want to disable the signal of the function, it doesn't
need to query the state of the mux function's signal on a pin. The
condition below will miss the disable of the signal:
Ball | Default | P0 Signal | P0 Expression               | Other
-----+---------+-----------+-----------------------------+----------
 E21   GPIOG0    SD2CLK      SCU4B4[16]=1 & SCU450[1]=1    GPIOG0
-----+---------+-----------+-----------------------------+----------
 B22   GPIOG1    SD2CMD      SCU4B4[17]=1 & SCU450[1]=1    GPIOG1
-----+---------+-----------+-----------------------------+----------
Assume the register status like below:
SCU4B4[16] == 1 & SCU4B4[17] == 1 & SCU450[1]==1
After the driver set the Ball E21 to the GPIOG0:
SCU4B4[16] == 0 & SCU4B4[17] == 1 & SCU450[1]==0
When the driver want to set the Ball B22 to the GPIOG1, the condition of
the SD2CMD will be false causing SCU4B4[17] not to be cleared.

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Acked-by: Andrew Jeffery <andrew@aj.id.au>
Link: https://lore.kernel.org/r/20220818101839.28860-1-billy_tsai@aspeedtech.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Billy Tsai 2022-08-18 18:18:39 +08:00 • committed by Linus Walleij
parent 1ebfe7e361
commit cf517fef60
1 changed files with 1 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

11
drivers/pinctrl/aspeed/pinctrl-aspeed.c
View file

@ -92,19 +92,10 @@ static int aspeed_sig_expr_enable(struct aspeed_pinmux_data *ctx,
static int aspeed_sig_expr_disable(struct aspeed_pinmux_data *ctx, static int aspeed_sig_expr_disable(struct aspeed_pinmux_data *ctx,
const struct aspeed_sig_expr *expr) const struct aspeed_sig_expr *expr)
{ {
int ret;
pr_debug("Disabling signal %s for %s\n", expr->signal, pr_debug("Disabling signal %s for %s\n", expr->signal,
expr->function); expr->function);
ret = aspeed_sig_expr_eval(ctx, expr, true); return aspeed_sig_expr_set(ctx, expr, false);
if (ret < 0)
return ret;
if (ret)
return aspeed_sig_expr_set(ctx, expr, false);
return 0;
} }
/** /**