linux-kernel - Re: [PATCH 03/89] i2c: brcmstb: Support BCM2711 HDMI BSC controllers

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Message-ID: <20200310101229.GM1987@ninjato>
Date:   Tue, 10 Mar 2020 11:12:29 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Eric Anholt <eric@...olt.net>, dri-devel@...ts.freedesktop.org,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        Kamal Dasu <kdasu.kdev@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-i2c@...r.kernel.org
Subject: Re: [PATCH 03/89] i2c: brcmstb: Support BCM2711 HDMI BSC controllers

On Mon, Feb 24, 2020 at 10:06:05AM +0100, Maxime Ripard wrote:
> The HDMI blocks in the BCM2771 have an i2c controller to retrieve the
> EDID. This block is split into two parts, the BSC and the AUTO_I2C,
> lying in two separate register areas.
> 
> The AUTO_I2C block has a mailbox-like interface and will take away the
> BSC control from the CPU if enabled. However, the BSC is the actually
> the same controller than the one supported by the brcmstb driver, and
> the AUTO_I2C doesn't really bring any immediate benefit.
> 
> Let's use the BSC then, but let's also tie the AUTO_I2C registers with a
> separate compatible so that we can enable AUTO_I2C if needed in the
> future.
> 
> The AUTO_I2C is enabled by default at boot though, so we first need to
> release the BSC from the AUTO_I2C control.
> 
> Cc: Kamal Dasu <kdasu.kdev@...il.com>
> Cc: Florian Fainelli <f.fainelli@...il.com>
> Cc: Wolfram Sang <wsa@...-dreams.de>
> Cc: bcm-kernel-feedback-list@...adcom.com
> Cc: linux-i2c@...r.kernel.org
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

Fixed the acked-by and applied to for-next, thanks!

FYI, cppcheck rightfully warned about this in the driver:

drivers/i2c/busses/i2c-brcmstb.c:319:7: warning: Condition 'CMD_RD' is always true [knownConditionTrueFalse]
 if ((CMD_RD || CMD_WR) &&
      ^
drivers/i2c/busses/i2c-brcmstb.c:319:17: warning: Condition 'CMD_WR' is always false [knownConditionTrueFalse]
 if ((CMD_RD || CMD_WR) &&
                ^
drivers/i2c/busses/i2c-brcmstb.c:464:0: warning: Variable 'len' is assigned a value that is never used. [unreadVariable]
 int len = 0;

Not related to this patch, but maybe one of you is interested...


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