On Thu, 04 Sep 2014, Sebastian Andrzej Siewior wrote:
> From: Jeff Lance <j-lance1@xxxxxx>
>
> The logic in AFE_Pen_Ctrl bitmask in the CTRL register is different for five
> wire versus four or eight wire touschscreens. This patch should fix this for
> five-wire touch screens. There should be no change needed here for four and
> eight wire tousch screens.
>
> Signed-off-by: Jeff Lance <j-lance1@xxxxxx>
> [bigeasy: keep the change mfd only]
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
> ---
> I've been looking at moving this piece and the idle mode setting into the
> TSC driver. Kinda odd that I have to patch within the MFD driver for this
> TSC related change.
> Anyone disagrees?
>
> drivers/mfd/ti_am335x_tscadc.c | 30 +++++++++++++++++-------------
> include/linux/mfd/ti_am335x_tscadc.h | 1 +
> 2 files changed, 18 insertions(+), 13 deletions(-)
I hope this has been fully tested.
Looks like it could work though, so applied, thanks.
> diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
> index dd4bf5816221..6c9cfb8c1d01 100644
> --- a/drivers/mfd/ti_am335x_tscadc.c
> +++ b/drivers/mfd/ti_am335x_tscadc.c
> @@ -241,18 +241,20 @@ static int ti_tscadc_probe(struct platform_device *pdev)
> tscadc_writel(tscadc, REG_CLKDIV, tscadc->clk_div);
>
> /* Set the control register bits */
> - ctrl = CNTRLREG_STEPCONFIGWRT |
> - CNTRLREG_STEPID;
> - if (tsc_wires > 0)
> - ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;
> + ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID;
> tscadc_writel(tscadc, REG_CTRL, ctrl);
>
> /* Set register bits for Idle Config Mode */
> - if (tsc_wires > 0)
> + if (tsc_wires > 0) {
> + tscadc->tsc_wires = tsc_wires;
> + if (tsc_wires == 5)
> + ctrl |= CNTRLREG_5WIRE | CNTRLREG_TSCENB;
> + else
> + ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;
> tscadc_idle_config(tscadc);
> + }
>
> /* Enable the TSC module enable bit */
> - ctrl = tscadc_readl(tscadc, REG_CTRL);
> ctrl |= CNTRLREG_TSCSSENB;
> tscadc_writel(tscadc, REG_CTRL, ctrl);
>
> @@ -324,21 +326,23 @@ static int tscadc_suspend(struct device *dev)
> static int tscadc_resume(struct device *dev)
> {
> struct ti_tscadc_dev *tscadc_dev = dev_get_drvdata(dev);
> - unsigned int restore, ctrl;
> + u32 ctrl;
>
> pm_runtime_get_sync(dev);
>
> /* context restore */
> ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID;
> - if (tscadc_dev->tsc_cell != -1)
> - ctrl |= CNTRLREG_TSCENB | CNTRLREG_4WIRE;
> tscadc_writel(tscadc_dev, REG_CTRL, ctrl);
>
> - if (tscadc_dev->tsc_cell != -1)
> + if (tscadc_dev->tsc_cell != -1) {
> + if (tscadc_dev->tsc_wires == 5)
> + ctrl |= CNTRLREG_5WIRE | CNTRLREG_TSCENB;
> + else
> + ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;
> tscadc_idle_config(tscadc_dev);
> - restore = tscadc_readl(tscadc_dev, REG_CTRL);
> - tscadc_writel(tscadc_dev, REG_CTRL,
> - (restore | CNTRLREG_TSCSSENB));
> + }
> + ctrl |= CNTRLREG_TSCSSENB;
> + tscadc_writel(tscadc_dev, REG_CTRL, ctrl);
>
> tscadc_writel(tscadc_dev, REG_CLKDIV, tscadc_dev->clk_div);
>
> diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
> index fb96c84dada5..e2e70053470e 100644
> --- a/include/linux/mfd/ti_am335x_tscadc.h
> +++ b/include/linux/mfd/ti_am335x_tscadc.h
> @@ -155,6 +155,7 @@ struct ti_tscadc_dev {
> void __iomem *tscadc_base;
> int irq;
> int used_cells; /* 1-2 */
> + int tsc_wires;
> int tsc_cell; /* -1 if not used */
> int adc_cell; /* -1 if not used */
> struct mfd_cell cells[TSCADC_CELLS];
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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