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

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Date:   Wed, 07 Aug 2019 23:02:57 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Kishon Vijay Abraham I <kishon@...com>
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

Am Mittwoch, 7. August 2019, 21:23:05 CEST schrieb Nathan Chancellor:
> 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>
> ---

Reviewed-by: Heiko Stuebner <heiko@...ech.de>

on a rk3328-rock64 hdmi output still works
Tested-by: Heiko Stuebner <heiko@...ech.de>

@Kishon: Would probably be good to get this fast into 5.3-rc.


Heiko


>  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)
>