diff options
Diffstat (limited to 'target/linux/generic/pending-5.4/820-libata-Assign-OF-node-to-the-SCSI-device.patch')
| -rw-r--r-- | target/linux/generic/pending-5.4/820-libata-Assign-OF-node-to-the-SCSI-device.patch | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/target/linux/generic/pending-5.4/820-libata-Assign-OF-node-to-the-SCSI-device.patch b/target/linux/generic/pending-5.4/820-libata-Assign-OF-node-to-the-SCSI-device.patch new file mode 100644 index 0000000000..9e72313ec9 --- /dev/null +++ b/target/linux/generic/pending-5.4/820-libata-Assign-OF-node-to-the-SCSI-device.patch @@ -0,0 +1,86 @@ +From 43a93893eb33e996836b99fb3e1f7300c0132a51 Mon Sep 17 00:00:00 2001 +From: Linus Walleij <linus.walleij@linaro.org> +Date: Tue, 31 Dec 2019 18:15:33 +0100 +Subject: [PATCH 5/7] libata: Assign OF node to the SCSI device + +When we spawn a SCSI device from an ATA device in libata-scsi +the SCSI device had no relation to the device tree. + +The DT binding allows us to define port nodes under a +PATA (IDE) or SATA host controller, so we can have proper device +nodes for these devices. + +If OF is enabled, walk the children of the host controller node +to see if there is a valid device tree node to assign. The reg +is used to match to ID 0 for the master device and ID 1 for the +slave device. + +The corresponding device tree bindings have been accepted by +the device tree maintainers. + +Cc: Chris Healy <cphealy@gmail.com> +Cc: Martin K. Petersen <martin.petersen@oracle.com> +Cc: Bart Van Assche <bvanassche@acm.org> +Cc: Guenter Roeck <linux@roeck-us.net> +Signed-off-by: Linus Walleij <linus.walleij@linaro.org> +--- +ChangeLog v1->v2: +- Use dev_dbg() for the debug print +- return immediately after finding a matching OF node +--- + drivers/ata/libata-scsi.c | 30 ++++++++++++++++++++++++++++++ + 1 file changed, 30 insertions(+) + +--- a/drivers/ata/libata-scsi.c ++++ b/drivers/ata/libata-scsi.c +@@ -35,6 +35,7 @@ + #include <linux/suspend.h> + #include <asm/unaligned.h> + #include <linux/ioprio.h> ++#include <linux/of.h> + + #include "libata.h" + #include "libata-transport.h" +@@ -4573,6 +4574,34 @@ int ata_scsi_add_hosts(struct ata_host * + return rc; + } + ++#ifdef CONFIG_OF ++static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap) ++{ ++ struct scsi_device *sdev = dev->sdev; ++ struct device *d = ap->host->dev; ++ struct device_node *np = d->of_node; ++ struct device_node *child; ++ ++ for_each_available_child_of_node(np, child) { ++ int ret; ++ u32 val; ++ ++ ret = of_property_read_u32(child, "reg", &val); ++ if (ret) ++ continue; ++ if (val == dev->devno) { ++ dev_dbg(d, "found matching device node\n"); ++ sdev->sdev_gendev.of_node = child; ++ return; ++ } ++ } ++} ++#else ++static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap) ++{ ++} ++#endif ++ + void ata_scsi_scan_host(struct ata_port *ap, int sync) + { + int tries = 5; +@@ -4598,6 +4627,7 @@ void ata_scsi_scan_host(struct ata_port + NULL); + if (!IS_ERR(sdev)) { + dev->sdev = sdev; ++ ata_scsi_assign_ofnode(dev, ap); + scsi_device_put(sdev); + } else { + dev->sdev = NULL; |