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

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Date:   Tue, 20 Aug 2019 11:12:20 -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,
        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: Re: [PATCH] phy-rockchip-inno-hdmi: Fix
 RK3328_TERM_RESISTOR_CALIB_SPEED_7_0's third value

On Wed, Aug 07, 2019 at 12:23:05PM -0700, Nathan Chancellor wrote:
> 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
> 

There was a v3 of linux/bits.h: Add compile time sanity check of GENMASK
inputs sent and this needs to be picked up to avoid build breakage when
that is applied. Could someone please pick this up?

Cheers,
Nathan