6.6-stable review patch. If anyone has any objections, please let me know.
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From: Hugo Villeneuve hvilleneuve@dimonoff.com
commit c6cb8bf79466ae66bd0d07338c7c505ce758e9d7 upstream.
The current reset pulse width is measured to be 5us on a Renesas RZ/G2L SOM. The manufacturer's minimum reset pulse width is specified as 10us.
Extend reset pulse width to make sure it is long enough on all platforms.
Also reword confusing comments about reset pin assertion.
Fixes: 5b0c03e24a06 ("Input: Add driver for Cypress Generation 5 touchscreen") Cc: stable@vger.kernel.org Acked-by: Alistair Francis alistair@alistair23.me Signed-off-by: Hugo Villeneuve hvilleneuve@dimonoff.com Link: https://lore.kernel.org/r/20250410184633.1164837-1-hugo@hugovil.com Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/input/touchscreen/cyttsp5.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/input/touchscreen/cyttsp5.c +++ b/drivers/input/touchscreen/cyttsp5.c @@ -865,13 +865,16 @@ static int cyttsp5_probe(struct device * ts->input->phys = ts->phys; input_set_drvdata(ts->input, ts);
- /* Reset the gpio to be in a reset state */ + /* Assert gpio to be in a reset state */ ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); if (IS_ERR(ts->reset_gpio)) { error = PTR_ERR(ts->reset_gpio); dev_err(dev, "Failed to request reset gpio, error %d\n", error); return error; } + + fsleep(10); /* Ensure long-enough reset pulse (minimum 10us). */ + gpiod_set_value_cansleep(ts->reset_gpio, 0);
/* Need a delay to have device up */