From 3dafbe93be5d33113af1137c0e54a754cb72551b Mon Sep 17 00:00:00 2001 From: Miquel Raynal Date: Fri, 15 Oct 2021 10:14:39 +0200 Subject: mfd: ti_am335x_tscadc: Reorder the initialization steps TI AM335X TRM [1] states that most of the configuration should be set in the control register in the first place, before actually enabling the hardware with the subsystem enable bit. So far only half of the configuration was made in the first step (before enabling the "subsystem"), which does not make really sense. Also, the probe and the resume patch were acting differently. Let's harmonize all this by following these steps: 1/ Configure the CLKDIV register 2/ Configure the CTRL register 3/ Configure the idle configuration 4/ Really enable the device by rewriting the CTRL register with the subsystem enable bit set. [1] https://www.ti.com/lit/pdf/spruh73 Signed-off-by: Miquel Raynal Reviewed-by: Jonathan Cameron Signed-off-by: Lee Jones Link: https://lore.kernel.org/r/20211015081506.933180-22-miquel.raynal@bootlin.com --- drivers/mfd/ti_am335x_tscadc.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) (limited to 'drivers/mfd') diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index d1f70224e457..01c2b7d1c18c 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -219,8 +219,6 @@ static int ti_tscadc_probe(struct platform_device *pdev) /* Set the control register bits */ ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID; - regmap_write(tscadc->regmap, REG_CTRL, ctrl); - if (tsc_wires > 0) { tscadc->tsc_wires = tsc_wires; if (tsc_wires == 5) @@ -228,6 +226,7 @@ static int ti_tscadc_probe(struct platform_device *pdev) else ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB; } + regmap_write(tscadc->regmap, REG_CTRL, ctrl); tscadc_idle_config(tscadc); @@ -313,9 +312,9 @@ static int __maybe_unused tscadc_resume(struct device *dev) pm_runtime_get_sync(dev); /* context restore */ - ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID; - regmap_write(tscadc->regmap, REG_CTRL, ctrl); + regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div); + ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID; if (tscadc->tsc_wires > 0) { if (tscadc->tsc_wires == 5) ctrl |= CNTRLREG_5WIRE | CNTRLREG_TSCENB; @@ -323,13 +322,13 @@ static int __maybe_unused tscadc_resume(struct device *dev) ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB; } + regmap_write(tscadc->regmap, REG_CTRL, ctrl); + tscadc_idle_config(tscadc); ctrl |= CNTRLREG_TSCSSENB; regmap_write(tscadc->regmap, REG_CTRL, ctrl); - regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div); - return 0; } -- cgit v1.2.3-59-g8ed1b