This is a note to let you know that I've just added the patch titled
iio: adc: rockchip_saradc: use mask for write_enable bitfield
to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-next branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will also be merged in the next major kernel release during the merge window.
If you have any questions about this process, please let me know.
From 5b4e4b72034f85f7a0cdd147d3d729c5a22c8764 Mon Sep 17 00:00:00 2001 From: Quentin Schulz quentin.schulz@theobroma-systems.com Date: Fri, 23 Feb 2024 13:45:22 +0100 Subject: iio: adc: rockchip_saradc: use mask for write_enable bitfield
Some of the registers on the SARADCv2 have bits write protected except if another bit is set. This is usually done by having the lowest 16 bits store the data to write and the highest 16 bits specify which of the 16 lowest bits should have their value written to the hardware block.
The write_enable mask for the channel selection was incorrect because it was just the value shifted by 16 bits, which means it would only ever write bits and never clear them. So e.g. if someone starts a conversion on channel 5, the lowest 4 bits would be 0x5, then starts a conversion on channel 0, it would still be 5.
Instead of shifting the value by 16 as the mask, let's use the OR'ing of the appropriate masks shifted by 16.
Note that this is not an issue currently because the only SARADCv2 currently supported has a reset defined in its Device Tree, that reset resets the SARADC controller before starting a conversion on a channel. However, this reset is handled as optional by the probe function and thus proper masking should be used in the event an SARADCv2 without a reset ever makes it upstream.
Fixes: 757953f8ec69 ("iio: adc: rockchip_saradc: Add support for RK3588") Signed-off-by: Quentin Schulz quentin.schulz@theobroma-systems.com Reviewed-by: Heiko Stuebner heiko@sntech.de Link: https://lore.kernel.org/r/20240223-saradcv2-chan-mask-v1-2-84b06a0f623a@theo... Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/iio/adc/rockchip_saradc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c index 2da8d6f3241a..1c0042fbbb54 100644 --- a/drivers/iio/adc/rockchip_saradc.c +++ b/drivers/iio/adc/rockchip_saradc.c @@ -102,12 +102,12 @@ static void rockchip_saradc_start_v2(struct rockchip_saradc *info, int chn) writel_relaxed(0xc, info->regs + SARADC_T_DAS_SOC); writel_relaxed(0x20, info->regs + SARADC_T_PD_SOC); val = FIELD_PREP(SARADC2_EN_END_INT, 1); - val |= val << 16; + val |= SARADC2_EN_END_INT << 16; writel_relaxed(val, info->regs + SARADC2_END_INT_EN); val = FIELD_PREP(SARADC2_START, 1) | FIELD_PREP(SARADC2_SINGLE_MODE, 1) | FIELD_PREP(SARADC2_CONV_CHANNELS, chn); - val |= val << 16; + val |= (SARADC2_START | SARADC2_SINGLE_MODE | SARADC2_CONV_CHANNELS) << 16; writel(val, info->regs + SARADC2_CONV_CON); }