linux-kernel - [PATCH AUTOSEL 6.6 2/7] spi: hisi-kunpeng: Add validation for the minimum value of speed

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Message-ID: <20240814021517.4130238-2-sashal@kernel.org>
Date: Tue, 13 Aug 2024 22:15:08 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Devyn Liu <liudingyuan@...wei.com>,
	Jay Fang <f.fangjian@...wei.com>,
	Mark Brown <broonie@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	linux-spi@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 2/7] spi: hisi-kunpeng: Add validation for the minimum value of speed_hz

From: Devyn Liu <liudingyuan@...wei.com>

[ Upstream commit c3c4f22b7c814a6ee485ce294065836f8ede30fa ]

The speed specified by the user is used to calculate the clk_div based
on the max_speed_hz in hisi_calc_effective_speed.  A very low speed
value can lead to a clk_div larger than the variable range. Avoid this
by setting the min_speed_hz so that such a small speed value is
rejected.  __spi_validate() in spi.c will return -EINVAL for the
specified speed_hz lower than min_speed_hz.

Signed-off-by: Devyn Liu <liudingyuan@...wei.com>
Reviewed-by: Jay Fang <f.fangjian@...wei.com>
Link: https://patch.msgid.link/20240730032040.3156393-2-liudingyuan@huawei.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/spi/spi-hisi-kunpeng.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/spi-hisi-kunpeng.c b/drivers/spi/spi-hisi-kunpeng.c
index 77e9738e42f60..6910b4d4c427b 100644
--- a/drivers/spi/spi-hisi-kunpeng.c
+++ b/drivers/spi/spi-hisi-kunpeng.c
@@ -495,6 +495,7 @@ static int hisi_spi_probe(struct platform_device *pdev)
 	host->transfer_one = hisi_spi_transfer_one;
 	host->handle_err = hisi_spi_handle_err;
 	host->dev.fwnode = dev->fwnode;
+	host->min_speed_hz = DIV_ROUND_UP(host->max_speed_hz, CLK_DIV_MAX);
 
 	hisi_spi_hw_init(hs);
 
-- 
2.43.0