Date: Tue, 23 Oct 2018 08:23:27 +0000 From: "Amartya, Shreyank" <Shreyank.Amartya@amd.com> To: "freebsd-drivers@freebsd.org" <freebsd-drivers@freebsd.org> Subject: eMMC AMD platform Message-ID: <SN6PR12MB2813785A929D9DD89C0E6E3391F50@SN6PR12MB2813.namprd12.prod.outlook.com>
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Hi, I have an AMD eMMC 5.0 controller connected to an eMMC device. I recently got around to enabling HS400 mode but the performance is still s= ame what I was getting in HS200 mode. Is there a way to verify the HS400 mode is active? Patch for enabling HS400: https://reviews.freebsd.org/D17644 In order to enable the HS400 mode I had to clear the Sampling clock select = bit (Host control 2 register) and then set it later (as part of the patch). Now, I suspect that this led to reset of the tuning circuit and that even t= hough HS400 mode is enabled, since it is not tuned, I do not see increase i= n performance. Could that be a possibility? There is a similar patch for linux and I've tried it, it works on my board = with HS400 mode (~200 MB/s), measured using iozone. Linux patch: https://patchwork.kernel.org/patch/10086747/ Thanks Shreyank Amartya
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