linux-kernel - [PATCH 1/3] media: sun6i: Fix CSI regmap's max

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Message-Id: <20190203160358.21050-2-wens@csie.org>
Date:   Mon,  4 Feb 2019 00:03:56 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Yong Deng <yong.deng@...ewell.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH 1/3] media: sun6i: Fix CSI regmap's max_register

max_register is currently set to 0x1000. This is beyond the mapped
address range of the hardware, so attempts to dump the regmap from
debugfs would trigger a kernel exception.

Furthermore, the useful registers only occupy a small section at the
beginning of the full range. Change the value to 0x9c, the last known
register on the V3s and H3.

On the A31, the register range is extended to support additional
capture channels. Since this is not yet supported, ignore it for now.

Fixes: 5cc7522d8965 ("media: sun6i: Add support for Allwinner CSI V3s")
Cc: <stable@...r.kernel.org>
Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
index ee882b66a5ea..332cf81a7ecf 100644
--- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
@@ -793,7 +793,7 @@ static const struct regmap_config sun6i_csi_regmap_config = {
 	.reg_bits       = 32,
 	.reg_stride     = 4,
 	.val_bits       = 32,
-	.max_register	= 0x1000,
+	.max_register	= 0x9c,
 };
 
 static int sun6i_csi_resource_request(struct sun6i_csi_dev *sdev,
-- 
2.20.1