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From: Stephen Boyd <swboyd@chromium.org>
To: Jonathan Cameron <jic23@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
	Daniel Campello <campello@chromium.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
	Douglas Anderson <dianders@chromium.org>,
	Gwendal Grignou <gwendal@chromium.org>,
	Evan Green <evgreen@chromium.org>
Subject: [PATCH] iio: sx9310: Fix semtech,avg-pos-strength setting when > 16
Date: Thu, 19 Nov 2020 23:38:42 -0800	[thread overview]
Message-ID: <20201120073842.3232458-1-swboyd@chromium.org> (raw)

This DT property can be 0, 16, and then 64, but not 32. The math here
doesn't recognize this slight bump in the power of 2 numbers and
translates a DT property of 64 into the register value '3' when it
really should be '2'. Fix it by subtracting one more if the number being
translated is larger than 16.

Cc: Daniel Campello <campello@chromium.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Gwendal Grignou <gwendal@chromium.org>
Cc: Evan Green <evgreen@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---

This fixes commit 5b19ca2c78a0 ("iio: sx9310: Set various settings from
DT") in the togreg branch.

 drivers/iio/proximity/sx9310.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c
index a2f820997afc..5d8387ed9301 100644
--- a/drivers/iio/proximity/sx9310.c
+++ b/drivers/iio/proximity/sx9310.c
@@ -1305,7 +1305,7 @@ sx9310_get_default_reg(struct sx9310_data *data, int i,
 		if (ret)
 			break;
 
-		pos = min(max(ilog2(pos), 3), 10) - 3;
+		pos = min(max(ilog2(pos), 3), 11) - (pos > 16 ? 4 : 3);
 		reg_def->def &= ~SX9310_REG_PROX_CTRL7_AVGPOSFILT_MASK;
 		reg_def->def |= FIELD_PREP(SX9310_REG_PROX_CTRL7_AVGPOSFILT_MASK,
 					   pos);

base-commit: 5b19ca2c78a0838976064c0347e46a2c859b541d
-- 
https://chromeos.dev


             reply	other threads:[~2020-11-20  7:39 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-20  7:38 Stephen Boyd [this message]
2020-11-20 18:16 ` Doug Anderson
2020-11-20 18:21   ` Stephen Boyd

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