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msm: gpio: Re-arrange the write to RAW_STATUS_EN

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Move enabling the RAW_STATUS_EN at the very beginning.
Hardware team clarified that it is better to write to
RAW_STATUS_EN before writing to any other INTR_CFG bits
in order to prevent spurious interrupts.
Removing writing to the GPIO_INTR_CFG_SU register for
gpio-v2 and remove modifying any other bits except
INTR_ENABLE in mask/unmask calls as it could cause spurious
interrupts as well.

Change-Id: Ia025b324ee3be8073960eac73899f733336cac4c
CRs-Fixed: 346861
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
This commit is contained in:
Rohit Vaswani 2012-08-03 11:47:42 -07:00 committed by Stephen Boyd
parent 3f3ba6ffeb
commit 8e6112aaca
2 changed files with 24 additions and 29 deletions
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25
drivers/gpio/gpio-msm-v2.c
View file

@ -149,10 +149,8 @@ void __msm_gpio_set_intr_cfg_enable(unsigned gpio, unsigned val)
{
if (val) {
set_gpio_bits(INTR_ENABLE, GPIO_INTR_CFG(gpio));
__raw_writel(TARGET_PROC_SCORPION, GPIO_INTR_CFG_SU(gpio));
} else {
__raw_writel(TARGET_PROC_NONE, GPIO_INTR_CFG_SU(gpio));
clr_gpio_bits(INTR_ENABLE, GPIO_INTR_CFG(gpio));
}
}
@ -161,6 +159,15 @@ void __msm_gpio_set_intr_cfg_type(unsigned gpio, unsigned type)
{
unsigned cfg;
/* RAW_STATUS_EN is left on for all gpio irqs. Due to the
* internal circuitry of TLMM, toggling the RAW_STATUS
* could cause the INTR_STATUS to be set for EDGE interrupts.
*/
cfg = __msm_gpio_get_intr_config(gpio);
cfg |= INTR_RAW_STATUS_EN;
__raw_writel(cfg, GPIO_INTR_CFG(gpio));
__raw_writel(TARGET_PROC_SCORPION, GPIO_INTR_CFG_SU(gpio));
cfg = __msm_gpio_get_intr_config(gpio);
if (type & IRQ_TYPE_EDGE_BOTH)
cfg |= INTR_DECT_CTL_EDGE;
@ -172,23 +179,13 @@ void __msm_gpio_set_intr_cfg_type(unsigned gpio, unsigned type)
else
cfg &= ~INTR_POL_CTL_HI;
/* RAW_STATUS_EN is left on for all gpio irqs. Due to the
* internal circuitry of TLMM, toggling the RAW_STATUS
* could cause the INTR_STATUS to be set for EDGE interrupts.
*/
cfg |= INTR_RAW_STATUS_EN;
__raw_writel(cfg, GPIO_INTR_CFG(gpio));
/* Sometimes it might take a little while to update
* the interrupt status after the RAW_STATUS is enabled
* We clear the interrupt status before enabling the
* interrupt in the unmask call-back.
*/
udelay(5);
/* Clear the interrupt status to clear out any spurious
* irq as a result of the above operation
*/
__msm_gpio_set_intr_status(gpio);
}
void __gpio_tlmm_config(unsigned config)

28
drivers/gpio/gpio-msm-v3.c
View file

@ -155,11 +155,10 @@ void __msm_gpio_set_intr_cfg_enable(unsigned gpio, unsigned val)
cfg = __raw_readl(GPIO_INTR_CFG(gpio));
if (val) {
cfg &= ~(INTR_TARGET_PROC_NONE | INTR_DIR_CONN_EN);
cfg |= INTR_ENABLE | INTR_TARGET_PROC_APPS;
cfg &= ~INTR_DIR_CONN_EN;
cfg |= INTR_ENABLE;
} else {
cfg &= ~(INTR_TARGET_PROC_APPS | INTR_ENABLE);
cfg |= INTR_TARGET_PROC_NONE;
cfg &= ~INTR_ENABLE;
}
__raw_writel(cfg, GPIO_INTR_CFG(gpio));
}
@ -168,6 +167,14 @@ void __msm_gpio_set_intr_cfg_type(unsigned gpio, unsigned type)
{
unsigned cfg;
cfg = __raw_readl(GPIO_INTR_CFG(gpio));
/* RAW_STATUS_EN is left on for all gpio irqs. Due to the
* internal circuitry of TLMM, toggling the RAW_STATUS
* could cause the INTR_STATUS to be set for EDGE interrupts.
*/
cfg |= (INTR_RAW_STATUS_EN | INTR_TARGET_PROC_APPS);
__raw_writel(cfg, GPIO_INTR_CFG(gpio));
cfg = __raw_readl(GPIO_INTR_CFG(gpio));
cfg &= ~INTR_DECT_CTL_MASK;
if (type == IRQ_TYPE_EDGE_RISING)
@ -184,22 +191,13 @@ void __msm_gpio_set_intr_cfg_type(unsigned gpio, unsigned type)
else
cfg &= ~INTR_POL_CTL_HI;
/* RAW_STATUS_EN is left on for all gpio irqs. Due to the
* internal circuitry of TLMM, toggling the RAW_STATUS
* could cause the INTR_STATUS to be set for EDGE interrupts.
*/
cfg |= INTR_RAW_STATUS_EN;
__raw_writel(cfg, GPIO_INTR_CFG(gpio));
/* Sometimes it might take a little while to update
* the interrupt status after the RAW_STATUS is enabled
* We clear the interrupt status before enabling the
* interrupt in the unmask call-back.
*/
udelay(5);
/* Clear the interrupt status to clear out any spurious
* irq as a result of the above operation
*/
__msm_gpio_set_intr_status(gpio);
}
void __gpio_tlmm_config(unsigned config)