linux-kernel - Re: [PATCH 2/2] mmc: mtk-sd: Limit getting top

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Message-ID: <6b4f98ab-5bfe-406d-a0d4-46d36ed10df7@collabora.com>
Date: Mon, 9 Dec 2024 11:14:29 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Chen-Yu Tsai <wenst@...omium.org>,
 Chaotian Jing <chaotian.jing@...iatek.com>,
 Ulf Hansson <ulf.hansson@...aro.org>,
 Matthias Brugger <matthias.bgg@...il.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Wenbin Mei <wenbin.mei@...iatek.com>
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 devicetree@...r.kernel.org, Frank Wunderlich <frank-w@...lic-files.de>,
 Andy-ld Lu <andy-ld.lu@...iatek.com>
Subject: Re: [PATCH 2/2] mmc: mtk-sd: Limit getting top_base to SoCs that
 require it

Il 04/12/24 10:28, Chen-Yu Tsai ha scritto:
> Currently the mtk-sd driver tries to get and map the second register
> base, named top_base in the code, regardless of whether the SoC model
> actually has it or not. This produces confusing big error messages on
> the platforms that don't need it:
> 
>      mtk-msdc 11260000.mmc: error -EINVAL: invalid resource (null)
> 
> Limit it to the platforms that actually require it, based on their
> device tree entries, and properly fail if it is missing. There is
> no MMC node in the MT6779 dts, so it's currently unknown if that
> platform needs it or not.
> 

No, it doesn't require it. The controller is (very) similar to the one
found on MT6795 :-)

> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>

Can you please remove that "I don't know about mt6779" mention, now that
you do know?

Btw,

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

> ---
>   drivers/mmc/host/mtk-sd.c | 15 +++++++++++----
>   1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index e2c385853eef..1bb7044f4ca1 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -414,6 +414,7 @@ struct mtk_mmc_compatible {
>   	u8 clk_div_bits;
>   	bool recheck_sdio_irq;
>   	bool hs400_tune; /* only used for MT8173 */
> +	bool needs_top_base;
>   	u32 pad_tune_reg;
>   	bool async_fifo;
>   	bool data_tune;
> @@ -587,6 +588,7 @@ static const struct mtk_mmc_compatible mt7986_compat = {
>   	.clk_div_bits = 12,
>   	.recheck_sdio_irq = true,
>   	.hs400_tune = false,
> +	.needs_top_base = true,
>   	.pad_tune_reg = MSDC_PAD_TUNE0,
>   	.async_fifo = true,
>   	.data_tune = true,
> @@ -627,6 +629,7 @@ static const struct mtk_mmc_compatible mt8183_compat = {
>   	.clk_div_bits = 12,
>   	.recheck_sdio_irq = false,
>   	.hs400_tune = false,
> +	.needs_top_base = true,
>   	.pad_tune_reg = MSDC_PAD_TUNE0,
>   	.async_fifo = true,
>   	.data_tune = true,
> @@ -653,6 +656,7 @@ static const struct mtk_mmc_compatible mt8196_compat = {
>   	.clk_div_bits = 12,
>   	.recheck_sdio_irq = false,
>   	.hs400_tune = false,
> +	.needs_top_base = true,
>   	.pad_tune_reg = MSDC_PAD_TUNE0,
>   	.async_fifo = true,
>   	.data_tune = true,
> @@ -2887,9 +2891,13 @@ static int msdc_drv_probe(struct platform_device *pdev)
>   	if (IS_ERR(host->base))
>   		return PTR_ERR(host->base);
>   
> -	host->top_base = devm_platform_ioremap_resource(pdev, 1);
> -	if (IS_ERR(host->top_base))
> -		host->top_base = NULL;
> +	host->dev_comp = of_device_get_match_data(&pdev->dev);
> +
> +	if (host->dev_comp->needs_top_base) {
> +		host->top_base = devm_platform_ioremap_resource(pdev, 1);
> +		if (IS_ERR(host->top_base))
> +			return PTR_ERR(host->top_base);
> +	}
>   
>   	ret = mmc_regulator_get_supply(mmc);
>   	if (ret)
> @@ -2951,7 +2959,6 @@ static int msdc_drv_probe(struct platform_device *pdev)
>   	msdc_of_property_parse(pdev, host);
>   
>   	host->dev = &pdev->dev;
> -	host->dev_comp = of_device_get_match_data(&pdev->dev);
>   	host->src_clk_freq = clk_get_rate(host->src_clk);
>   	/* Set host parameters to mmc */
>   	mmc->ops = &mt_msdc_ops;