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Date:   Tue, 22 Nov 2022 17:07:49 +0100
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Jon Hunter <jonathanh@nvidia.com>
Cc:     Mathias Nyman <mathias.nyman@intel.com>,
        krzysztof.kozlowski+dt@linaro.org, robh+dt@kernel.org,
        vkoul@kernel.org, treding@nvidia.com, linux-usb@vger.kernel.org,
        devicetree@vger.kernel.org, linux-phy@lists.infradead.org,
        linux-tegra@vger.kernel.org, waynec@nvidia.com,
        Sing-Han Chen <singhanc@nvidia.com>
Subject: Re: [PATCH V4 5/6] usb: host: xhci-tegra: Add Tegra234 XHCI support
Message-ID: <Y3zz1YHu1643ppuS@kroah.com>
References: <20221118154006.173082-1-jonathanh@nvidia.com>
 <20221118154006.173082-6-jonathanh@nvidia.com>
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On Fri, Nov 18, 2022 at 03:40:05PM +0000, Jon Hunter wrote:
> From: Sing-Han Chen <singhanc@nvidia.com>
> 
> This change adds Tegra234 XUSB host mode controller support.
> 
> In Tegra234, some of the registers have moved to bar2 space.
> The new soc variable has_bar2 indicates the chip with bar2
> area. This patch adds new reg helper to let the driver reuse
> the same code for those chips with bar2 support.
> 
> Signed-off-by: Sing-Han Chen <singhanc@nvidia.com>
> Co-developed-by: Wayne Chang <waynec@nvidia.com>
> Signed-off-by: Wayne Chang <waynec@nvidia.com>
> Signed-off-by: Jon Hunter <jonathanh@nvidia.com>

This is should be much slower with the additional redirection.  Is it
noticable on this hardware platform with, and without this change?  Or
is the hardware slow enough that it doesn't even show up as a speed
decrease?

thanks,

greg k-h