linux-kernel - Re: [PATCH v2 2/2] mmc: host: sdhci-esdhc-imx: update esdhc sysctl dtocv bitmask

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Message-ID: <61fa7a34-fa77-4a7e-b6cb-45fb5e671249@solid-run.com>
Date: Wed, 30 Oct 2024 13:44:28 +0000
From: Josua Mayer <josua@...id-run.com>
To: Adrian Hunter <adrian.hunter@...el.com>, Haibo Chen <haibo.chen@....com>,
	Ulf Hansson <ulf.hansson@...aro.org>, Shawn Guo <shawnguo@...nel.org>, Sascha
 Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team
	<kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>
CC: Mikhail Anikin <mikhail.anikin@...id-run.com>, Jon Nettleton
	<jon@...id-run.com>, Yazan Shhady <yazan.shhady@...id-run.com>, Rabeeh Khoury
	<rabeeh@...id-run.com>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>, "s32@....com"
	<s32@....com>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] mmc: host: sdhci-esdhc-imx: update esdhc sysctl
 dtocv bitmask

Am 30.10.24 um 14:37 schrieb Josua Mayer:
> NXP ESDHC supports setting data timeout using uSDHCx_SYS_CTRL register
> DTOCV bits (bits 16-19).
> Currently the driver accesses those bits by 32-bit write using
> SDHCI_TIMEOUT_CONTROL (0x2E) defined in drivers/mmc/host/sdhci.h.
> This is offset by two bytes relative to uSDHCx_SYS_CTRL (0x2C).
> The driver also defines ESDHC_SYS_CTRL_DTOCV_MASK as first 4 bits, which
> is correct relative to SDHCI_TIMEOUT_CONTROL but not relative to
> uSDHCx_SYS_CTRL. The definition carrying control register in its name is
> therefore inconsistent.
>
> Update the bitmask definition for bits 16-19 to be correct relative to
> control register base.
> Update the esdhc_set_timeout function to set timeout value at control
> register base, not timeout offset.
>
> This solves a purely cosmetic problem.
>
> Signed-off-by: Josua Mayer <josua@...id-run.com>
> ---
>  drivers/mmc/host/sdhci-esdhc-imx.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index a830d9a9490408d3148b927bf1acc719a13e8975..101feabb24fb41bd10a2e796f4f3f8d4357dc245 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -30,10 +30,10 @@
>  #include "sdhci-esdhc.h"
>  #include "cqhci.h"
>  
> -#define ESDHC_SYS_CTRL_DTOCV_MASK	0x0f
>  #define	ESDHC_CTRL_D3CD			0x08
>  #define ESDHC_BURST_LEN_EN_INCR		(1 << 27)
>  #define ESDHC_SYS_CTRL			0x2c
> +#define ESDHC_SYS_CTRL_DTOCV_MASK	GENMASK(19, 16)
>  #define ESDHC_SYS_CTRL_IPP_RST_N	BIT(23)
>  /* VENDOR SPEC register */
>  #define ESDHC_VENDOR_SPEC		0xc0
> @@ -1387,7 +1387,7 @@ static void esdhc_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
>  
>  	/* use maximum timeout counter */
>  	esdhc_clrset_le(host, ESDHC_SYS_CTRL_DTOCV_MASK,
> -			esdhc_is_usdhc(imx_data) ? 0xF : 0xE,
> +			esdhc_is_usdhc(imx_data) ? 0x0F0000 : 0x0E0000,
>  			SDHCI_TIMEOUT_CONTROL);
^^ There is a mistake here, intended: ESDHC_SYS_CTRL
(I changed that last second while writing commit description :( )
>  }
>  
>