linux-kernel - [PATCH 5.5 176/189] ARM: dts: imx7-colibri: Fix frequency for sd/mmc

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Date:   Tue, 10 Mar 2020 13:40:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Oleksandr Suvorov <oleksandr.suvorov@...adex.com>,
        Fabio Estevam <festevam@...il.com>,
        Shawn Guo <shawnguo@...nel.org>
Subject: [PATCH 5.5 176/189] ARM: dts: imx7-colibri: Fix frequency for sd/mmc

From: Oleksandr Suvorov <oleksandr.suvorov@...adex.com>

commit 2773fe1d31c42ffae2a9cb9a6055d99dd86e2fee upstream.

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>
Signed-off-by: Shawn Guo <shawnguo@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/arch/arm/boot/dts/imx7-colibri.dtsi
+++ b/arch/arm/boot/dts/imx7-colibri.dtsi
@@ -336,7 +336,6 @@
 	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;