Patch "ata: ahci: Add Elkhart Lake AHCI controller" has been added to the 5.15-stable tree

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

    ata: ahci: Add Elkhart Lake AHCI controller

to the 5.15-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:
     ata-ahci-add-elkhart-lake-ahci-controller.patch
and it can be found in the queue-5.15 subdirectory.

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



commit 1f3d5748e591d13de71c0ae715fc83a8af4c3294
Author: Werner Fischer <devlists@xxxxxxxx>
Date:   Tue Aug 29 13:33:58 2023 +0200

    ata: ahci: Add Elkhart Lake AHCI controller
    
    [ Upstream commit 2a2df98ec592667927b5c1351afa6493ea125c9f ]
    
    Elkhart Lake is the successor of Apollo Lake and Gemini Lake. These
    CPUs and their PCHs are used in mobile and embedded environments.
    
    With this patch I suggest that Elkhart Lake SATA controllers [1] should
    use the default LPM policy for mobile chipsets.
    The disadvantage of missing hot-plug support with this setting should
    not be an issue, as those CPUs are used in embedded environments and
    not in servers with hot-plug backplanes.
    
    We discovered that the Elkhart Lake SATA controllers have been missing
    in ahci.c after a customer reported the throttling of his SATA SSD
    after a short period of higher I/O. We determined the high temperature
    of the SSD controller in idle mode as the root cause for that.
    
    Depending on the used SSD, we have seen up to 1.8 Watt lower system
    idle power usage and up to 30°C lower SSD controller temperatures in
    our tests, when we set med_power_with_dipm manually. I have provided a
    table showing seven different SATA SSDs from ATP, Intel/Solidigm and
    Samsung [2].
    
    Intel lists a total of 3 SATA controller IDs (4B60, 4B62, 4B63) in [1]
    for those mobile PCHs.
    This commit just adds 0x4b63 as I do not have test systems with 0x4b60
    and 0x4b62 SATA controllers.
    I have tested this patch with a system which uses 0x4b63 as SATA
    controller.
    
    [1] https://sata-io.org/product/8803
    [2] https://www.thomas-krenn.com/en/wiki/SATA_Link_Power_Management#Example_LES_v4
    
    Signed-off-by: Werner Fischer <devlists@xxxxxxxx>
    Cc: stable@xxxxxxxxxxxxxxx
    Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 3679433108eca..3147b2e6cd8c9 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -425,6 +425,8 @@ static const struct pci_device_id ahci_pci_tbl[] = {
 	{ PCI_VDEVICE(INTEL, 0x34d3), board_ahci_low_power }, /* Ice Lake LP AHCI */
 	{ PCI_VDEVICE(INTEL, 0x02d3), board_ahci_low_power }, /* Comet Lake PCH-U AHCI */
 	{ PCI_VDEVICE(INTEL, 0x02d7), board_ahci_low_power }, /* Comet Lake PCH RAID */
+	/* Elkhart Lake IDs 0x4b60 & 0x4b62 https://sata-io.org/product/8803 not tested yet */
+	{ PCI_VDEVICE(INTEL, 0x4b63), board_ahci_low_power }, /* Elkhart Lake AHCI */
 
 	/* JMicron 360/1/3/5/6, match class to avoid IDE function */
 	{ PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,



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