From 3a71c05e66e597a1349fdbd5f0bb119d8d9cb850 Mon Sep 17 00:00:00 2001 From: Loic Poulain Date: Fri, 26 Sep 2014 16:14:51 +0200 Subject: [PATCH 1/3] pinctrl: baytrail: Clear DIRECT_IRQ bit Direct irq en bit should be cleared for pads using io mode. If not, the io based irq will never be detected. However, this bit can sometimes be misconfigured (BIOS issue). Force clearing of this bit in io mode and trigger a WARN. Signed-off-by: Loic Poulain Acked-by: Mika Westerberg Signed-off-by: Linus Walleij --- drivers/pinctrl/pinctrl-baytrail.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/pinctrl/pinctrl-baytrail.c b/drivers/pinctrl/pinctrl-baytrail.c index e12e5b07f6d7..b83ec87c71fe 100644 --- a/drivers/pinctrl/pinctrl-baytrail.c +++ b/drivers/pinctrl/pinctrl-baytrail.c @@ -227,10 +227,14 @@ static int byt_irq_type(struct irq_data *d, unsigned type) spin_lock_irqsave(&vg->lock, flags); value = readl(reg); + WARN(value & BYT_DIRECT_IRQ_EN, + "Bad pad config for io mode, force direct_irq_en bit clearing"); + /* For level trigges the BYT_TRIG_POS and BYT_TRIG_NEG bits * are used to indicate high and low level triggering */ - value &= ~(BYT_TRIG_POS | BYT_TRIG_NEG | BYT_TRIG_LVL); + value &= ~(BYT_DIRECT_IRQ_EN | BYT_TRIG_POS | BYT_TRIG_NEG | + BYT_TRIG_LVL); switch (type) { case IRQ_TYPE_LEVEL_HIGH: From c11f042b8607f38410351fb30c224783f2b24fb7 Mon Sep 17 00:00:00 2001 From: David Cohen Date: Thu, 16 Oct 2014 19:06:59 -0700 Subject: [PATCH 2/3] pinctrl: use linux-gpio mailing list The GPIO concepts are close enough to pin control that we may use the same mailing list to discuss them. Signed-off-by: Linus Walleij --- MAINTAINERS | 1 + 1 file changed, 1 insertion(+) diff --git a/MAINTAINERS b/MAINTAINERS index a20df9bf8ab0..d7df7913c618 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7153,6 +7153,7 @@ F: drivers/crypto/picoxcell* PIN CONTROL SUBSYSTEM M: Linus Walleij +L: linux-gpio@vger.kernel.org S: Maintained F: drivers/pinctrl/ F: include/linux/pinctrl/ From d90c33818967c5e5371961604ad98b4dea4fa3f4 Mon Sep 17 00:00:00 2001 From: David Cohen Date: Tue, 14 Oct 2014 10:54:37 -0700 Subject: [PATCH 3/3] pinctrl: baytrail: show output gpio state correctly on Intel Baytrail Even if a gpio pin is set to output, we still need to set INPUT_EN functionality (by clearing INPUT_EN bit) to be able to read the pin's level. E.g. without this change, we'll always read low level state from sysfs. Cc: # v3.14+ Cc: Mathias Nyman Signed-off-by: David Cohen Reviewed-by: Felipe Balbi Signed-off-by: Linus Walleij --- drivers/pinctrl/pinctrl-baytrail.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pinctrl/pinctrl-baytrail.c b/drivers/pinctrl/pinctrl-baytrail.c index b83ec87c71fe..9dc38140194b 100644 --- a/drivers/pinctrl/pinctrl-baytrail.c +++ b/drivers/pinctrl/pinctrl-baytrail.c @@ -322,7 +322,7 @@ static int byt_gpio_direction_output(struct gpio_chip *chip, "Potential Error: Setting GPIO with direct_irq_en to output"); reg_val = readl(reg) | BYT_DIR_MASK; - reg_val &= ~BYT_OUTPUT_EN; + reg_val &= ~(BYT_OUTPUT_EN | BYT_INPUT_EN); if (value) writel(reg_val | BYT_LEVEL, reg);