linux-kernel - [PATCH] mmc: sdhci-esdhc-imx: improve ESDHC_FLAG

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Message-Id: <20230811214853.8623-1-giulio.benetti@benettiengineering.com>
Date:   Fri, 11 Aug 2023 23:48:53 +0200
From:   Giulio Benetti <giulio.benetti@...ettiengineering.com>
To:     Haibo Chen <haibo.chen@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Giulio Benetti <giulio.benetti@...ettiengineering.com>,
        Jim Reinhart <jimr@...vox.com>,
        James Autry <jautry@...vox.com>,
        Matthew Maron <matthewm@...vox.com>
Subject: [PATCH] mmc: sdhci-esdhc-imx: improve ESDHC_FLAG_ERR010450

Errata ERR010450 only shows up if voltage is 1.8V, but if the device is
supplied by 3v3 the errata can be ignored. So let's check for if quirk
SDHCI_QUIRK2_NO_1_8_V is defined or not before limiting the frequency.

Sponsored by: Tekvox Inc.
Cc: Jim Reinhart <jimr@...vox.com>
Cc: James Autry <jautry@...vox.com>
Cc: Matthew Maron <matthewm@...vox.com>
Signed-off-by: Giulio Benetti <giulio.benetti@...ettiengineering.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index eebf94604a7f..cddecc1e1ac2 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -171,8 +171,8 @@
 #define ESDHC_FLAG_HS400		BIT(9)
 /*
  * The IP has errata ERR010450
- * uSDHC: Due to the I/O timing limit, for SDR mode, SD card clock can't
- * exceed 150MHz, for DDR mode, SD card clock can't exceed 45MHz.
+ * uSDHC: At 1.8V due to the I/O timing limit, for SDR mode, SD card
+ * clock can't exceed 150MHz, for DDR mode, SD card clock can't exceed 45MHz.
  */
 #define ESDHC_FLAG_ERR010450		BIT(10)
 /* The IP supports HS400ES mode */
@@ -961,7 +961,8 @@ static inline void esdhc_pltfm_set_clock(struct sdhci_host *host,
 		| ESDHC_CLOCK_MASK);
 	sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
 
-	if (imx_data->socdata->flags & ESDHC_FLAG_ERR010450) {
+	if ((imx_data->socdata->flags & ESDHC_FLAG_ERR010450) &&
+	    (!(host->quirks2 & SDHCI_QUIRK2_NO_1_8_V))) {
 		unsigned int max_clock;
 
 		max_clock = imx_data->is_ddr ? 45000000 : 150000000;
-- 
2.34.1