From: Yixun Lan <dlan@kernel.org>
To: Adrian Hunter <adrian.hunter@intel.com>, Ulf Hansson <ulfh@kernel.org>
Cc: Long Wan <long.wan@linux.spacemit.com>,
linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org, spacemit@lists.linux.dev,
Yixun Lan <dlan@kernel.org>
Subject: [PATCH 5/7] mmc: sdhci-of-k1: Use finest delay granularity for RX tuning
Date: Wed, 02 Sep 2026 08:04:26 +0000 [thread overview]
Message-ID: <20260902-07-k3-sdhci-fix-v1-5-b15c5d0f64fd@kernel.org> (raw)
In-Reply-To: <20260902-07-k3-sdhci-fix-v1-0-b15c5d0f64fd@kernel.org>
From: Long Wan <long.wan@linux.spacemit.com>
Initialize the RX delay line to 0 (finest step size) instead of 9.
This improves tuning precision by allowing smaller delay increments
when searching for the optimal sampling point.
Fixes: e9cb83c10071 ("mmc: sdhci-of-k1: add comprehensive SDR tuning support")
Signed-off-by: Long Wan <long.wan@linux.spacemit.com>
Signed-off-by: Yixun Lan <dlan@kernel.org>
---
drivers/mmc/host/sdhci-of-k1.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci-of-k1.c b/drivers/mmc/host/sdhci-of-k1.c
index be770e8a9884..257c954ce587 100644
--- a/drivers/mmc/host/sdhci-of-k1.c
+++ b/drivers/mmc/host/sdhci-of-k1.c
@@ -84,7 +84,7 @@
#define SDHC_RX_DLINE_GAIN BIT(8)
#define SDHC_TX_DLINE_REG_MASK GENMASK(23, 16)
-#define SPACEMIT_RX_DLINE_REG 9
+#define SPACEMIT_RX_DLINE_REG 0
#define SPACEMIT_RX_TUNE_DELAY_MIN 0x0
#define SPACEMIT_RX_TUNE_DELAY_MAX 0xFF
--
2.55.0
next prev parent reply other threads:[~2026-09-02 8:05 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 8:04 [PATCH 0/7] mmc: spacemit: improve clock and tuning logic Yixun Lan
2026-09-02 8:04 ` [PATCH 1/7] mmc: sdhci-of-k1: no pinctrl state switching Yixun Lan
2026-09-02 8:04 ` [PATCH 2/7] mmc: sdhci-of-k1: drop duplicated voltage settings Yixun Lan
2026-09-02 8:04 ` [PATCH 3/7] mmc: sdhci-of-k1: configure PHY mode Yixun Lan
2026-09-02 8:04 ` [PATCH 4/7] mmc: sdhci-of-k1: Improve power control Yixun Lan
2026-09-02 8:04 ` Yixun Lan [this message]
2026-09-02 8:04 ` [PATCH 6/7] mmc: sdhci-of-k1: Improve RX tuning window Yixun Lan
2026-09-07 15:53 ` Hung-Chun Tseng
2026-09-02 8:04 ` [PATCH 7/7] mmc: sdhci-of-k1: Implement SD clock gating for voltage switch Yixun Lan
2026-09-09 8:40 ` [PATCH 0/7] mmc: spacemit: improve clock and tuning logic Adrian Hunter
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