| Message ID | 1414408111-2631-3-git-send-email-vigneshr@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, 27 Oct 2014, Vignesh R wrote: > From: Brad Griffis <bgriffis@ti.com> > > TSC interrupt handler had udelay to avoid reporting of false pen-up > interrupt to user space. This patch implements workaround suggesting in > Advisory 1.0.31 of silicon errata for am335x, thus eliminating udelay > and touchscreen lag. This also improves performance of touchscreen and > eliminates sudden jump of cursor at touch release. > > IDLECONFIG and CHARGECONFIG registers are to be configured > with same values in order to eliminate false pen-up events. This > workaround may result in false pen-down to be detected, hence considerable > charge step delay needs to be added. The charge delay is set to 0xB000 > (in terms of ADC clock cycles) by default. > > TSC steps are disabled at the end of every sampling cycle and EOS bit is > set. Once the EOS bit is set, the TSC steps need to be re-enabled to begin > next sampling cycle. > > In one shot mode, sequencer automatically disables all enabled steps at > the end of each cycle. (both ADC steps and TSC steps) Hence these steps > need not be saved in reg_se_cache for clearing these steps at a later > stage. > > Signed-off-by: Brad Griffis <bgriffis@ti.com> > [vigneshr@ti.com: Ported patch from v3.12 to v3.18rc2] > Signed-off-by: Vignesh R <vigneshr@ti.com> > --- > drivers/input/touchscreen/ti_am335x_tsc.c | 56 ++++++++++++------------------- > drivers/mfd/ti_am335x_tscadc.c | 7 ++-- > include/linux/mfd/ti_am335x_tscadc.h | 4 ++- > 3 files changed, 30 insertions(+), 37 deletions(-) [...] > diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c > index d877e777cce6..94ef8992f46b 100644 > --- a/drivers/mfd/ti_am335x_tscadc.c > +++ b/drivers/mfd/ti_am335x_tscadc.c > @@ -86,8 +86,12 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc) > spin_lock_irq(&tsadc->reg_lock); > finish_wait(&tsadc->reg_se_wait, &wait); > > + /* > + * Sequencer should either be idle or > + * busy applying the charge step. > + */ > reg = tscadc_readl(tsadc, REG_ADCFSM); > - WARN_ON(reg & SEQ_STATUS); > + WARN_ON(reg & SEQ_STATUS & (!CHARGE_STEP)); > tsadc->adc_waiting = false; > } > tsadc->adc_in_use = true; > @@ -96,7 +100,6 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc) > void am335x_tsc_se_set_once(struct ti_tscadc_dev *tsadc, u32 val) > { > spin_lock_irq(&tsadc->reg_lock); > - tsadc->reg_se_cache |= val; > am335x_tscadc_need_adc(tsadc); > > tscadc_writel(tsadc, REG_SE, val); I believe all of these changes can, and therefor should live in a separate patch. > diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h > index e2e70053470e..fcce182e4a35 100644 > --- a/include/linux/mfd/ti_am335x_tscadc.h > +++ b/include/linux/mfd/ti_am335x_tscadc.h > @@ -52,6 +52,7 @@ > > /* IRQ enable */ > #define IRQENB_HW_PEN BIT(0) > +#define IRQENB_EOS BIT(1) > #define IRQENB_FIFO0THRES BIT(2) > #define IRQENB_FIFO0OVRRUN BIT(3) > #define IRQENB_FIFO0UNDRFLW BIT(4) > @@ -107,7 +108,7 @@ > /* Charge delay */ > #define CHARGEDLY_OPEN_MASK (0x3FFFF << 0) > #define CHARGEDLY_OPEN(val) ((val) << 0) > -#define CHARGEDLY_OPENDLY CHARGEDLY_OPEN(1) > +#define CHARGEDLY_OPENDLY CHARGEDLY_OPEN(0xB000) > > /* Control register */ > #define CNTRLREG_TSCSSENB BIT(0) > @@ -127,6 +128,7 @@ > > /* Sequencer Status */ > #define SEQ_STATUS BIT(5) > +#define CHARGE_STEP 0x11 > > #define ADC_CLK 3000000 > #define TOTAL_STEPS 16 The header changes should be split between the two Input and MFD patches.
On Monday 03 November 2014 08:35 PM, Lee Jones wrote: > On Mon, 27 Oct 2014, Vignesh R wrote: >> From: Brad Griffis <bgriffis@ti.com> >> >> TSC interrupt handler had udelay to avoid reporting of false pen-up >> interrupt to user space. This patch implements workaround suggesting in >> Advisory 1.0.31 of silicon errata for am335x, thus eliminating udelay >> and touchscreen lag. This also improves performance of touchscreen and >> eliminates sudden jump of cursor at touch release. >> >> IDLECONFIG and CHARGECONFIG registers are to be configured >> with same values in order to eliminate false pen-up events. This >> workaround may result in false pen-down to be detected, hence considerable >> charge step delay needs to be added. The charge delay is set to 0xB000 >> (in terms of ADC clock cycles) by default. >> >> TSC steps are disabled at the end of every sampling cycle and EOS bit is >> set. Once the EOS bit is set, the TSC steps need to be re-enabled to begin >> next sampling cycle. >> >> In one shot mode, sequencer automatically disables all enabled steps at >> the end of each cycle. (both ADC steps and TSC steps) Hence these steps >> need not be saved in reg_se_cache for clearing these steps at a later >> stage. >> >> Signed-off-by: Brad Griffis <bgriffis@ti.com> >> [vigneshr@ti.com: Ported patch from v3.12 to v3.18rc2] >> Signed-off-by: Vignesh R <vigneshr@ti.com> >> --- >> drivers/input/touchscreen/ti_am335x_tsc.c | 56 ++++++++++++------------------- >> drivers/mfd/ti_am335x_tscadc.c | 7 ++-- >> include/linux/mfd/ti_am335x_tscadc.h | 4 ++- >> 3 files changed, 30 insertions(+), 37 deletions(-) > > [...] > >> diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c >> index d877e777cce6..94ef8992f46b 100644 >> --- a/drivers/mfd/ti_am335x_tscadc.c >> +++ b/drivers/mfd/ti_am335x_tscadc.c >> @@ -86,8 +86,12 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc) >> spin_lock_irq(&tsadc->reg_lock); >> finish_wait(&tsadc->reg_se_wait, &wait); >> >> + /* >> + * Sequencer should either be idle or >> + * busy applying the charge step. >> + */ >> reg = tscadc_readl(tsadc, REG_ADCFSM); >> - WARN_ON(reg & SEQ_STATUS); >> + WARN_ON(reg & SEQ_STATUS & (!CHARGE_STEP)); >> tsadc->adc_waiting = false; >> } >> tsadc->adc_in_use = true; >> @@ -96,7 +100,6 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc) >> void am335x_tsc_se_set_once(struct ti_tscadc_dev *tsadc, u32 val) >> { >> spin_lock_irq(&tsadc->reg_lock); >> - tsadc->reg_se_cache |= val; >> am335x_tscadc_need_adc(tsadc); >> >> tscadc_writel(tsadc, REG_SE, val); > > I believe all of these changes can, and therefor should live in a > separate patch. I will split this patch accordingly. > >> diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h >> index e2e70053470e..fcce182e4a35 100644 >> --- a/include/linux/mfd/ti_am335x_tscadc.h >> +++ b/include/linux/mfd/ti_am335x_tscadc.h >> @@ -52,6 +52,7 @@ >> >> /* IRQ enable */ >> #define IRQENB_HW_PEN BIT(0) >> +#define IRQENB_EOS BIT(1) >> #define IRQENB_FIFO0THRES BIT(2) >> #define IRQENB_FIFO0OVRRUN BIT(3) >> #define IRQENB_FIFO0UNDRFLW BIT(4) >> @@ -107,7 +108,7 @@ >> /* Charge delay */ >> #define CHARGEDLY_OPEN_MASK (0x3FFFF << 0) >> #define CHARGEDLY_OPEN(val) ((val) << 0) >> -#define CHARGEDLY_OPENDLY CHARGEDLY_OPEN(1) >> +#define CHARGEDLY_OPENDLY CHARGEDLY_OPEN(0xB000) >> >> /* Control register */ >> #define CNTRLREG_TSCSSENB BIT(0) >> @@ -127,6 +128,7 @@ >> >> /* Sequencer Status */ >> #define SEQ_STATUS BIT(5) >> +#define CHARGE_STEP 0x11 >> >> #define ADC_CLK 3000000 >> #define TOTAL_STEPS 16 > > The header changes should be split between the two Input and MFD > patches. > -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c index 1aeac9675fe7..483fd97c0e0c 100644 --- a/drivers/input/touchscreen/ti_am335x_tsc.c +++ b/drivers/input/touchscreen/ti_am335x_tsc.c @@ -173,11 +173,9 @@ static void titsc_step_config(struct titsc *ts_dev) titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); } - /* Charge step configuration */ - config = ts_dev->bit_xp | ts_dev->bit_yn | - STEPCHARGE_RFP_XPUL | STEPCHARGE_RFM_XNUR | - STEPCHARGE_INM_AN1 | STEPCHARGE_INP(ts_dev->inp_yp); + /* Make CHARGECONFIG same as IDLECONFIG */ + config = titsc_readl(ts_dev, REG_IDLECONFIG); titsc_writel(ts_dev, REG_CHARGECONFIG, config); titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY); @@ -264,9 +262,26 @@ static irqreturn_t titsc_irq(int irq, void *dev) unsigned int status, irqclr = 0; unsigned int x = 0, y = 0; unsigned int z1, z2, z; - unsigned int fsm; - status = titsc_readl(ts_dev, REG_IRQSTATUS); + status = titsc_readl(ts_dev, REG_RAWIRQSTATUS); + if (status & IRQENB_HW_PEN) { + ts_dev->pen_down = true; + titsc_writel(ts_dev, REG_IRQWAKEUP, 0x00); + titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN); + irqclr |= IRQENB_HW_PEN; + } + + if (status & IRQENB_PENUP) { + ts_dev->pen_down = false; + input_report_key(input_dev, BTN_TOUCH, 0); + input_report_abs(input_dev, ABS_PRESSURE, 0); + input_sync(input_dev); + irqclr |= IRQENB_PENUP; + } + + if (status & IRQENB_EOS) + irqclr |= IRQENB_EOS; + /* * ADC and touchscreen share the IRQ line. * FIFO1 interrupts are used by ADC. Handle FIFO0 IRQs here only @@ -297,34 +312,6 @@ static irqreturn_t titsc_irq(int irq, void *dev) } irqclr |= IRQENB_FIFO0THRES; } - - /* - * Time for sequencer to settle, to read - * correct state of the sequencer. - */ - udelay(SEQ_SETTLE); - - status = titsc_readl(ts_dev, REG_RAWIRQSTATUS); - if (status & IRQENB_PENUP) { - /* Pen up event */ - fsm = titsc_readl(ts_dev, REG_ADCFSM); - if (fsm == ADCFSM_STEPID) { - ts_dev->pen_down = false; - input_report_key(input_dev, BTN_TOUCH, 0); - input_report_abs(input_dev, ABS_PRESSURE, 0); - input_sync(input_dev); - } else { - ts_dev->pen_down = true; - } - irqclr |= IRQENB_PENUP; - } - - if (status & IRQENB_HW_PEN) { - - titsc_writel(ts_dev, REG_IRQWAKEUP, 0x00); - titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN); - } - if (irqclr) { titsc_writel(ts_dev, REG_IRQSTATUS, irqclr); am335x_tsc_se_set_cache(ts_dev->mfd_tscadc, ts_dev->step_mask); @@ -417,6 +404,7 @@ static int titsc_probe(struct platform_device *pdev) } titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_FIFO0THRES); + titsc_writel(ts_dev, REG_IRQENABLE, IRQENB_EOS); err = titsc_config_wires(ts_dev); if (err) { dev_err(&pdev->dev, "wrong i/p wire configuration\n"); diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index d877e777cce6..94ef8992f46b 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -86,8 +86,12 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc) spin_lock_irq(&tsadc->reg_lock); finish_wait(&tsadc->reg_se_wait, &wait); + /* + * Sequencer should either be idle or + * busy applying the charge step. + */ reg = tscadc_readl(tsadc, REG_ADCFSM); - WARN_ON(reg & SEQ_STATUS); + WARN_ON(reg & SEQ_STATUS & (!CHARGE_STEP)); tsadc->adc_waiting = false; } tsadc->adc_in_use = true; @@ -96,7 +100,6 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc) void am335x_tsc_se_set_once(struct ti_tscadc_dev *tsadc, u32 val) { spin_lock_irq(&tsadc->reg_lock); - tsadc->reg_se_cache |= val; am335x_tscadc_need_adc(tsadc); tscadc_writel(tsadc, REG_SE, val); diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h index e2e70053470e..fcce182e4a35 100644 --- a/include/linux/mfd/ti_am335x_tscadc.h +++ b/include/linux/mfd/ti_am335x_tscadc.h @@ -52,6 +52,7 @@ /* IRQ enable */ #define IRQENB_HW_PEN BIT(0) +#define IRQENB_EOS BIT(1) #define IRQENB_FIFO0THRES BIT(2) #define IRQENB_FIFO0OVRRUN BIT(3) #define IRQENB_FIFO0UNDRFLW BIT(4) @@ -107,7 +108,7 @@ /* Charge delay */ #define CHARGEDLY_OPEN_MASK (0x3FFFF << 0) #define CHARGEDLY_OPEN(val) ((val) << 0) -#define CHARGEDLY_OPENDLY CHARGEDLY_OPEN(1) +#define CHARGEDLY_OPENDLY CHARGEDLY_OPEN(0xB000) /* Control register */ #define CNTRLREG_TSCSSENB BIT(0) @@ -127,6 +128,7 @@ /* Sequencer Status */ #define SEQ_STATUS BIT(5) +#define CHARGE_STEP 0x11 #define ADC_CLK 3000000 #define TOTAL_STEPS 16