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Message-ID: <98b6be8f-48db-5e7f-5fd7-825432235e06@xilinx.com>
Date: Mon, 16 Nov 2020 08:07:12 +0100
From: Michal Simek <michal.simek@...inx.com>
To: Manish Narani <manish.narani@...inx.com>,
<michal.simek@...inx.com>, <adrian.hunter@...el.com>,
<ulf.hansson@...aro.org>
CC: <linux-arm-kernel@...ts.infradead.org>,
<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<git@...inx.com>,
Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
Subject: Re: [PATCH 1/2] mmc: sdhci-of-arasan: Use Mask writes for Tap delays
On 16. 11. 20 7:15, Manish Narani wrote:
> Mask the ITAP and OTAP delay bits before updating with the new
> tap value for Versal platform.
>
> Fixes: 1a470721c8f5 ("sdhci: arasan: Add support for Versal Tap Delays")
> Signed-off-by: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@...inx.com>
> Signed-off-by: Manish Narani <manish.narani@...inx.com>
> ---
> drivers/mmc/host/sdhci-of-arasan.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index 100621e55427..3ec5ecad637c 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -30,7 +30,10 @@
> #define SDHCI_ARASAN_VENDOR_REGISTER 0x78
>
> #define SDHCI_ARASAN_ITAPDLY_REGISTER 0xF0F8
> +#define SDHCI_ARASAN_ITAPDLY_SEL_MASK 0xFF
> +
> #define SDHCI_ARASAN_OTAPDLY_REGISTER 0xF0FC
> +#define SDHCI_ARASAN_OTAPDLY_SEL_MASK 0x3F
>
> #define SDHCI_ARASAN_CQE_BASE_ADDR 0x200
> #define VENDOR_ENHANCED_STROBE BIT(0)
> @@ -755,6 +758,7 @@ static int sdhci_versal_sdcardclk_set_phase(struct clk_hw *hw, int degrees)
> regval = sdhci_readl(host, SDHCI_ARASAN_OTAPDLY_REGISTER);
> regval |= SDHCI_OTAPDLY_ENABLE;
> sdhci_writel(host, regval, SDHCI_ARASAN_OTAPDLY_REGISTER);
> + regval &= ~SDHCI_ARASAN_OTAPDLY_SEL_MASK;
> regval |= tap_delay;
> sdhci_writel(host, regval, SDHCI_ARASAN_OTAPDLY_REGISTER);
> }
> @@ -822,6 +826,7 @@ static int sdhci_versal_sampleclk_set_phase(struct clk_hw *hw, int degrees)
> sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER);
> regval |= SDHCI_ITAPDLY_ENABLE;
> sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER);
> + regval &= ~SDHCI_ARASAN_ITAPDLY_SEL_MASK;
> regval |= tap_delay;
> sdhci_writel(host, regval, SDHCI_ARASAN_ITAPDLY_REGISTER);
> regval &= ~SDHCI_ITAPDLY_CHGWIN;
>
Acked-by: Michal Simek <michal.simek@...inx.com>
Thanks,
Michal
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