Patch "ARM: dts: stm32: Reduce DHCOR SPI NOR frequency to 50 MHz" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

    ARM: dts: stm32: Reduce DHCOR SPI NOR frequency to 50 MHz

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm-dts-stm32-reduce-dhcor-spi-nor-frequency-to-50-m.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 9fd3517b289eeeaedbc3e683cd061b788120829e
Author: Marek Vasut <marex@xxxxxxx>
Date:   Mon Aug 9 14:13:24 2021 +0200

    ARM: dts: stm32: Reduce DHCOR SPI NOR frequency to 50 MHz
    
    [ Upstream commit 2012579b31293d0a8cf2024e9dab66810bf1a15e ]
    
    The SPI NOR is a bit further away from the SoC on DHCOR than on DHCOM,
    which causes additional signal delay. At 108 MHz, this delay triggers
    a sporadic issue where the first bit of RX data is not received by the
    QSPI controller.
    
    There are two options of addressing this problem, either by using the
    DLYB block to compensate the extra delay, or by reducing the QSPI bus
    clock frequency. The former requires calibration and that is overly
    complex, so opt for the second option.
    
    Fixes: 76045bc457104 ("ARM: dts: stm32: Add QSPI NOR on AV96")
    Signed-off-by: Marek Vasut <marex@xxxxxxx>
    Cc: Alexandre Torgue <alexandre.torgue@xxxxxxxxxxx>
    Cc: Patrice Chotard <patrice.chotard@xxxxxxxxxxx>
    Cc: Patrick Delaunay <patrick.delaunay@xxxxxxxxxxx>
    Cc: linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
    To: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
    Signed-off-by: Alexandre Torgue <alexandre.torgue@xxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi b/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi
index a9eb82b2f1704..5af32140e128b 100644
--- a/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi
+++ b/arch/arm/boot/dts/stm32mp15xx-dhcor-som.dtsi
@@ -198,7 +198,7 @@
 		compatible = "jedec,spi-nor";
 		reg = <0>;
 		spi-rx-bus-width = <4>;
-		spi-max-frequency = <108000000>;
+		spi-max-frequency = <50000000>;
 		#address-cells = <1>;
 		#size-cells = <1>;
 	};



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