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From: Sean Anderson <sean.anderson@seco.com>
To: Andre Przywara <andre.przywara@arm.com>,
	Simon Glass <sjg@chromium.org>,
	Jagan Teki <jagan@amarulasolutions.com>
Cc: u-boot@lists.denx.de, linux-sunxi@lists.linux.dev,
	Patrick Delaunay <patrick.delaunay@foss.st.com>,
	Heiko Schocher <hs@denx.de>,
	Kever Yang <kever.yang@rock-chips.com>,
	Philipp Tomsich <philipp.tomsich@vrull.eu>
Subject: Re: [RFC PATCH 2/3] sunxi: Implement fastboot_get_mmc_device()
Date: Mon, 24 May 2021 10:33:58 -0400	[thread overview]
Message-ID: <c4cd77a4-5e61-d2a4-15e3-164024e0051f@seco.com> (raw)
In-Reply-To: <20210524003650.24469-3-andre.przywara@arm.com>



On 5/23/21 8:36 PM, Andre Przywara wrote:
> The default MMC device to use for the fastboot flash command is hard to
> decide at runtime, since the numbering of the MMC devices depends on
> devicetree nodes. On the hardware side, the eMMC is connected to device
> 2, but this might be U-Boot's device 1 or 2, depending on whether the DT
> contains a WiFi node for the hardware MMC1 device.

Can you fix this with aliases? e.g.

aliases {
	mmc0 = &mmc0;
	mmc1 = &mmc1;
	mmc2 = &mmc2;
};

That way the mmcs will always have the same number even if (e.g.) hardware mmc 1 is absent.

--Sean

> 
> To avoid hardcoding this for each board, let's scan all MMC devices, and
> try to find the eMMC device, given that this is enabled. If not, we use
> the SD card.
> 
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
>   board/sunxi/board.c | 37 +++++++++++++++++++++++++++++++++++++
>   1 file changed, 37 insertions(+)
> 
> diff --git a/board/sunxi/board.c b/board/sunxi/board.c
> index 21651a1bfca..5f64887e48b 100644
> --- a/board/sunxi/board.c
> +++ b/board/sunxi/board.c
> @@ -625,6 +625,43 @@ int board_mmc_init(struct bd_info *bis)
>   }
>   #endif
>   
> +#ifdef CONFIG_FASTBOOT_FLASH_MMC
> +int fastboot_get_mmc_device(void)
> +{
> +	struct udevice *dev;
> +	static int mmc_dev = -1;
> +	int sd_card = -1;
> +
> +	if (mmc_dev != -1)
> +		return mmc_dev;
> +
> +	for (uclass_first_device(UCLASS_MMC, &dev);
> +	     dev;
> +	     uclass_next_device(&dev)) {
> +		struct mmc *mmc = mmc_get_mmc_dev(dev);
> +
> +		mmc_init(mmc);
> +		if (!mmc->has_init)
> +			continue;
> +
> +		if (IS_SD(mmc)) {
> +			sd_card = dev->seq_;
> +			continue;
> +		} else {
> +			mmc_dev =  dev->seq_;
> +			break;
> +		}
> +	}
> +
> +	if (mmc_dev == -1)
> +		mmc_dev = sd_card;
> +	if (mmc_dev == -1)
> +		mmc_dev = 0;
> +
> +	return mmc_dev;
> +}
> +#endif
> +
>   #ifdef CONFIG_SPL_BUILD
>   
>   static void sunxi_spl_store_dram_size(phys_addr_t dram_size)
> 

  reply	other threads:[~2021-05-24 14:34 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-24  0:36 [RFC PATCH 0/3] fastboot: sunxi: Determine MMC device at runtime Andre Przywara
2021-05-24  0:36 ` [RFC PATCH 1/3] fastboot: Allow runtime determination of MMC device Andre Przywara
2021-05-27 13:44   ` Simon Glass
2021-05-24  0:36 ` [RFC PATCH 2/3] sunxi: Implement fastboot_get_mmc_device() Andre Przywara
2021-05-24 14:33   ` Sean Anderson [this message]
2021-05-24 14:57     ` Andre Przywara
2021-05-24  0:36 ` [RFC PATCH 3/3] sunxi: Drop sunxi FASTBOOT_FLASH_MMC_DEV defaults Andre Przywara
2021-05-24 14:37 ` [RFC PATCH 0/3] fastboot: sunxi: Determine MMC device at runtime Sean Anderson
2021-05-24 15:15   ` Andre Przywara
2021-05-24 15:33     ` Sean Anderson
2021-05-24 15:28   ` Maxime Ripard
2021-05-24 15:43     ` Sean Anderson
2021-06-07 15:14       ` Maxime Ripard
2021-06-07 15:21         ` Sean Anderson

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