From: andy.tang@nxp.com
To: adrian.hunter@intel.com, ulf.hansson@linaro.org
Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
Yuantian Tang <andy.tang@nxp.com>
Subject: [PATCH] mmc: sdhci-of-esdhc: limit the SDHC clock frequency
Date: Thu, 24 Nov 2022 14:46:08 +0800 [thread overview]
Message-ID: <20221124064608.42019-1-andy.tang@nxp.com> (raw)
From: Yuantian Tang <andy.tang@nxp.com>
The highest clock frequency for eMMC HS200 mode on ls1043a
is 116.7Mhz according to its specification.
So add the limit to gate the frequency.
Signed-off-by: Andy Tang <andy.tang@nxp.com>
---
drivers/mmc/host/sdhci-of-esdhc.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 00542dd74c07..1fd4ae10862d 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -43,6 +43,12 @@ static const struct esdhc_clk_fixup ls1021a_esdhc_clk = {
.max_clk[MMC_TIMING_SD_HS] = 46500000,
};
+static const struct esdhc_clk_fixup ls1043a_esdhc_clk = {
+ .sd_dflt_max_clk = 25000000,
+ .max_clk[MMC_TIMING_UHS_SDR104] = 116700000,
+ .max_clk[MMC_TIMING_MMC_HS200] = 116700000,
+};
+
static const struct esdhc_clk_fixup ls1046a_esdhc_clk = {
.sd_dflt_max_clk = 25000000,
.max_clk[MMC_TIMING_UHS_SDR104] = 167000000,
@@ -64,6 +70,7 @@ static const struct esdhc_clk_fixup p1010_esdhc_clk = {
static const struct of_device_id sdhci_esdhc_of_match[] = {
{ .compatible = "fsl,ls1021a-esdhc", .data = &ls1021a_esdhc_clk},
+ { .compatible = "fsl,ls1043a-esdhc", .data = &ls1043a_esdhc_clk},
{ .compatible = "fsl,ls1046a-esdhc", .data = &ls1046a_esdhc_clk},
{ .compatible = "fsl,ls1012a-esdhc", .data = &ls1012a_esdhc_clk},
{ .compatible = "fsl,p1010-esdhc", .data = &p1010_esdhc_clk},
--
2.25.1
next reply other threads:[~2022-11-24 6:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-24 6:46 andy.tang [this message]
2022-11-29 8:04 ` [PATCH] mmc: sdhci-of-esdhc: limit the SDHC clock frequency Adrian Hunter
2022-11-29 9:22 ` [EXT] " Andy Tang
2022-12-02 7:59 andy.tang
2022-12-07 12:37 ` Ulf Hansson
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