linux-kernel - [PATCH v2] ARM: dts: imx7-colibri: Fix frequency for sd/mmc

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Date:   Wed, 19 Feb 2020 13:11:24 +0000
From:   Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
To:     "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
CC:     Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Igor Opanyuk <igor.opanyuk@...adex.com>,
        Philippe Schenker <philippe.schenker@...adex.com>,
        Oleksandr Suvorov <oleksandr.suvorov@...adex.com>,
        Fabio Estevam <festevam@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Stefan Agner <stefan@...er.ch>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] ARM: dts: imx7-colibri: Fix frequency for sd/mmc

SD/MMC on Colibri iMX7S/D modules successfully support
200Mhz frequency in HS200 mode.

Removing the unnecessary max-frequency limit significantly
increases the performance:

== before fix ====
root@...ibri-imx7-emmc:~# hdparm -t /dev/mmcblk0
/dev/mmcblk0:
 Timing buffered disk reads: 252 MB in  3.02 seconds =  83.54 MB/sec
==================

=== after fix ====
root@...ibri-imx7-emmc:~# hdparm -t /dev/mmcblk0
/dev/mmcblk0:
 Timing buffered disk reads: 408 MB in  3.00 seconds = 135.94 MB/sec
==================

Fixes: f928a4a377e4 ("ARM: dts: imx7: add Toradex Colibri iMX7D 1GB (eMMC) support")
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
Reviewed-by: Fabio Estevam <festevam@...il.com>
---

Changes in v2:
- keep the Fixes tag in the single line

 arch/arm/boot/dts/imx7-colibri.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx7-colibri.dtsi b/arch/arm/boot/dts/imx7-colibri.dtsi
index d05be3f0e2a7..04717cf69db0 100644
--- a/arch/arm/boot/dts/imx7-colibri.dtsi
+++ b/arch/arm/boot/dts/imx7-colibri.dtsi
@@ -336,7 +336,6 @@ &usdhc3 {
 	assigned-clock-rates = <400000000>;
 	bus-width = <8>;
 	fsl,tuning-step = <2>;
-	max-frequency = <100000000>;
 	vmmc-supply = <&reg_module_3v3>;
 	vqmmc-supply = <&reg_DCDC3>;
 	non-removable;
-- 
2.24.1