linux-kernel - [PATCH v4 3/4] mmc: dw_mmc-rockchip: Skip all phases bigger than 270 degrees

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Message-ID: <20240822212418.982927-4-detlev.casanova@collabora.com>
Date: Thu, 22 Aug 2024 17:15:33 -0400
From: Detlev Casanova <detlev.casanova@...labora.com>
To: linux-kernel@...r.kernel.org
Cc: Ulf Hansson <ulf.hansson@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	linux-mmc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	kernel@...labora.com,
	Shawn Lin <shawn.lin@...k-chips.com>,
	Detlev Casanova <detlev.casanova@...labora.com>
Subject: [PATCH v4 3/4] mmc: dw_mmc-rockchip: Skip all phases bigger than 270 degrees

From: Shawn Lin <shawn.lin@...k-chips.com>

Per design recommendation, it'd better not try to use any phase
which is bigger than 270. Let's officially follow this.

Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
(cherry picked from commit 2a53aab5cfa43065b2e979959d727332a8a03c03)
Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
---
 drivers/mmc/host/dw_mmc-rockchip.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
index 2748f9bf2691..1458cb5fd5c7 100644
--- a/drivers/mmc/host/dw_mmc-rockchip.c
+++ b/drivers/mmc/host/dw_mmc-rockchip.c
@@ -310,6 +310,9 @@ static int dw_mci_rk3288_execute_tuning(struct dw_mci_slot *slot, u32 opcode)
 
 	/* Try each phase and extract good ranges */
 	for (i = 0; i < priv->num_phases; ) {
+		/* Cannot guarantee any phases larger than 270 would work well */
+		if (TUNING_ITERATION_TO_PHASE(i, priv->num_phases) > 270)
+			break;
 		rockchip_mmc_set_phase(host, true,
 				       TUNING_ITERATION_TO_PHASE(
 						i,
-- 
2.46.0