pinctrl: qcom: lpass-lpi: set output value before enabling output

commit 163bfb0cb1f6fbf961cf912cbde57399ea1ae0e8 upstream.

As per Hardware Programming Guide, when configuring pin as output,
set the pin value before setting output-enable (OE).  Similar approach
is in main SoC TLMM pin controller.

Cc: <stable@vger.kernel.org>
Fixes: 6e261d1090d6 ("pinctrl: qcom: Add sm8250 lpass lpi pinctrl driver")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230309154949.658380-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
index e97ce45..a55998a 100644 (file)
--- a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
+++ b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
@@ -216,6 +216,15 @@ static int lpi_config_set(struct pinctrl_dev *pctldev, unsigned int group,
                }
        }
 
+       /*
+        * As per Hardware Programming Guide, when configuring pin as output,
+        * set the pin value before setting output-enable (OE).
+        */
+       if (output_enabled) {
+               val = u32_encode_bits(value ? 1 : 0, LPI_GPIO_VALUE_OUT_MASK);
+               lpi_gpio_write(pctrl, group, LPI_GPIO_VALUE_REG, val);
+       }
+
        val = lpi_gpio_read(pctrl, group, LPI_GPIO_CFG_REG);
 
        u32p_replace_bits(&val, pullup, LPI_GPIO_PULL_MASK);
@@ -225,11 +234,6 @@ static int lpi_config_set(struct pinctrl_dev *pctldev, unsigned int group,
 
        lpi_gpio_write(pctrl, group, LPI_GPIO_CFG_REG, val);
 
-       if (output_enabled) {
-               val = u32_encode_bits(value ? 1 : 0, LPI_GPIO_VALUE_OUT_MASK);
-               lpi_gpio_write(pctrl, group, LPI_GPIO_VALUE_REG, val);
-       }
-
        return 0;
 }