linux-kernel - [PATCH] phy-rockchip-inno-hdmi: Fix RK3328_TERM_RESISTOR_CALIB_SPEED_7

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Message-Id: <20190807192305.6604-1-natechancellor@gmail.com>
Date:   Wed,  7 Aug 2019 12:23:05 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org,
        Nathan Chancellor <natechancellor@...il.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Guenter Roeck <linux@...ck-us.net>,
        "kernelci . org bot" <bot@...nelci.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Robin Murphy <robin.murphy@....com>
Subject: [PATCH] phy-rockchip-inno-hdmi: Fix RK3328_TERM_RESISTOR_CALIB_SPEED_7_0's third value

After commit "linux/bits.h: Add compile time sanity check of GENMASK
inputs" [1], arm64 defconfig builds started failing:

In file included from ../include/linux/bits.h:22,
                 from ../include/linux/bitops.h:5,
                 from ../include/linux/kernel.h:12,
                 from ../include/linux/clk.h:13,
                 from ../drivers/phy/rockchip/phy-rockchip-inno-hdmi.c:9:
../drivers/phy/rockchip/phy-rockchip-inno-hdmi.c: In function 'inno_hdmi_phy_rk3328_power_on':
../include/linux/build_bug.h:16:45: error: negative width in bit-field '<anonymous>'
   16 | #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); }))
      |                                             ^
../include/linux/bits.h:24:18: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
   24 |  ((unsigned long)BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
      |                  ^~~~~~~~~~~~~~~~~
../include/linux/bits.h:39:3: note: in expansion of macro 'GENMASK_INPUT_CHECK'
   39 |  (GENMASK_INPUT_CHECK(high, low) + __GENMASK(high, low))
      |   ^~~~~~~~~~~~~~~~~~~
../drivers/phy/rockchip/phy-rockchip-inno-hdmi.c:24:42: note: in expansion of macro 'GENMASK'
   24 | #define UPDATE(x, h, l)  (((x) << (l)) & GENMASK((h), (l)))
      |                                          ^~~~~~~
../drivers/phy/rockchip/phy-rockchip-inno-hdmi.c:201:50: note: in expansion of macro 'UPDATE'
  201 | #define RK3328_TERM_RESISTOR_CALIB_SPEED_7_0(x)  UPDATE(x, 7, 9)
      |                                                  ^~~~~~
../drivers/phy/rockchip/phy-rockchip-inno-hdmi.c:1046:26: note: in expansion of macro 'RK3328_TERM_RESISTOR_CALIB_SPEED_7_0'
 1046 |   inno_write(inno, 0xc6, RK3328_TERM_RESISTOR_CALIB_SPEED_7_0(v));
      |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

As pointed out by Robin and Guenter, inno_write's val argument is an
8-bit value so having a mask larger than that doesn't make sense. This
also matches the rest of the *_7_0 macros in this driver.

[1]: https://lore.kernel.org/lkml/20190801230358.4193-2-rikard.falkeborn@gmail.com/

Reported-by: Andrzej Hajda <a.hajda@...sung.com>
Reported-by: Guenter Roeck <linux@...ck-us.net>
Reported-by: kernelci.org bot <bot@...nelci.org>
Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
Suggested-by: Guenter Roeck <linux@...ck-us.net>
Suggested-by: Robin Murphy <robin.murphy@....com>
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 drivers/phy/rockchip/phy-rockchip-inno-hdmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c b/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
index b10a84cab4a7..2b97fb1185a0 100644
--- a/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
@@ -198,7 +198,7 @@
 #define RK3328_BYPASS_TERM_RESISTOR_CALIB		BIT(7)
 #define RK3328_TERM_RESISTOR_CALIB_SPEED_14_8(x)	UPDATE((x) >> 8, 6, 0)
 /* REG:0xc6 */
-#define RK3328_TERM_RESISTOR_CALIB_SPEED_7_0(x)		UPDATE(x, 7, 9)
+#define RK3328_TERM_RESISTOR_CALIB_SPEED_7_0(x)		UPDATE(x, 7, 0)
 /* REG:0xc7 */
 #define RK3328_TERM_RESISTOR_50				UPDATE(0, 2, 1)
 #define RK3328_TERM_RESISTOR_62_5			UPDATE(1, 2, 1)
-- 
2.23.0.rc1