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GET /api/1.2/patches/807661/?format=api
HTTP 200 OK
Allow: GET, PUT, PATCH, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 807661,
    "url": "http://patchwork.ozlabs.org/api/1.2/patches/807661/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/uboot/patch/1504103793-21119-1-git-send-email-suresh.gupta@nxp.com/",
    "project": {
        "id": 18,
        "url": "http://patchwork.ozlabs.org/api/1.2/projects/18/?format=api",
        "name": "U-Boot",
        "link_name": "uboot",
        "list_id": "u-boot.lists.denx.de",
        "list_email": "u-boot@lists.denx.de",
        "web_url": null,
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        "webscm_url": null,
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<1504103793-21119-1-git-send-email-suresh.gupta@nxp.com>",
    "list_archive_url": null,
    "date": "2017-08-30T14:36:33",
    "name": "[U-Boot,v4] spi: fsl_qspi: Add controller busy check before new spi operation",
    "commit_ref": "1c631da459a82f4f82a063f5b4ff339ca5384d11",
    "pull_url": null,
    "state": "accepted",
    "archived": false,
    "hash": "974ff2520a94bf3ed84f63730f08bfc5a61d1143",
    "submitter": {
        "id": 70239,
        "url": "http://patchwork.ozlabs.org/api/1.2/people/70239/?format=api",
        "name": "Suresh Gupta",
        "email": "suresh.gupta@nxp.com"
    },
    "delegate": {
        "id": 17739,
        "url": "http://patchwork.ozlabs.org/api/1.2/users/17739/?format=api",
        "username": "jagan",
        "first_name": "Jagannadha Sutradharudu",
        "last_name": "Teki",
        "email": "jagannadh.teki@gmail.com"
    },
    "mbox": "http://patchwork.ozlabs.org/project/uboot/patch/1504103793-21119-1-git-send-email-suresh.gupta@nxp.com/mbox/",
    "series": [
        {
            "id": 627,
            "url": "http://patchwork.ozlabs.org/api/1.2/series/627/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/uboot/list/?series=627",
            "date": "2017-08-30T14:36:33",
            "name": "[U-Boot,v4] spi: fsl_qspi: Add controller busy check before new spi operation",
            "version": 4,
            "mbox": "http://patchwork.ozlabs.org/series/627/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/807661/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/807661/checks/",
    "tags": {},
    "related": [],
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        "From": "Suresh Gupta <suresh.gupta@nxp.com>",
        "To": "<u-boot@lists.denx.de>",
        "Date": "Wed, 30 Aug 2017 20:06:33 +0530",
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        "Cc": "Suresh Gupta <suresh.gupta@nxp.com>",
        "Subject": "[U-Boot] [PATCH v4] spi: fsl_qspi: Add controller busy check before\n\tnew spi operation",
        "X-BeenThere": "u-boot@lists.denx.de",
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        "List-Id": "U-Boot discussion <u-boot.lists.denx.de>",
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    },
    "content": "It is recommended to check either controller is free to take\nnew spi action. The IP_ACC and AHB_ACC bits indicates that\nthe controller is busy in IP or AHB mode respectively.\nAnd the BUSY bit indicates that controller is currently\nbusy handling a transaction to an external flash device\n\nSigned-off-by: Suresh Gupta <suresh.gupta@nxp.com>\n---\nChange in v4:\n - change Timeout from 1000ms to 100ms \n\n\nChanges in v3:\n - replace printf to debug\n - return whatever return from wait_for_bit, before it was -EBUSY\n\nChanges in v2:\n\n - Add wait_for_bit instead of while\n - move the busy check code to fsl_qspi_claim_bus form qspi_xfer\n\n\n drivers/spi/fsl_qspi.c | 28 +++++++++++++++++++++++++++-\n drivers/spi/fsl_qspi.h |  4 ++++\n 2 files changed, 31 insertions(+), 1 deletion(-)",
    "diff": "diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c\nindex 1dfa89a..8753ed9 100644\n--- a/drivers/spi/fsl_qspi.c\n+++ b/drivers/spi/fsl_qspi.c\n@@ -14,6 +14,7 @@\n #include <dm.h>\n #include <errno.h>\n #include <watchdog.h>\n+#include <wait_bit.h>\n #include \"fsl_qspi.h\"\n \n DECLARE_GLOBAL_DATA_PTR;\n@@ -991,7 +992,7 @@ static int fsl_qspi_probe(struct udevice *bus)\n \tstruct fsl_qspi_platdata *plat = dev_get_platdata(bus);\n \tstruct fsl_qspi_priv *priv = dev_get_priv(bus);\n \tstruct dm_spi_bus *dm_spi_bus;\n-\tint i;\n+\tint i, ret;\n \n \tdm_spi_bus = bus->uclass_priv;\n \n@@ -1011,6 +1012,18 @@ static int fsl_qspi_probe(struct udevice *bus)\n \tpriv->flash_num = plat->flash_num;\n \tpriv->num_chipselect = plat->num_chipselect;\n \n+\t/* make sure controller is not busy anywhere */\n+\tret = wait_for_bit(__func__, &priv->regs->sr,\n+\t\t\t   QSPI_SR_BUSY_MASK |\n+\t\t\t   QSPI_SR_AHB_ACC_MASK |\n+\t\t\t   QSPI_SR_IP_ACC_MASK,\n+\t\t\t   false, 100, false);\n+\n+\tif (ret) {\n+\t\tdebug(\"ERROR : The controller is busy\\n\");\n+\t\treturn ret;\n+\t}\n+\n \tmcr_val = qspi_read32(priv->flags, &priv->regs->mcr);\n \tqspi_write32(priv->flags, &priv->regs->mcr,\n \t\t     QSPI_MCR_RESERVED_MASK | QSPI_MCR_MDIS_MASK |\n@@ -1156,10 +1169,23 @@ static int fsl_qspi_claim_bus(struct udevice *dev)\n \tstruct fsl_qspi_priv *priv;\n \tstruct udevice *bus;\n \tstruct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);\n+\tint ret;\n \n \tbus = dev->parent;\n \tpriv = dev_get_priv(bus);\n \n+\t/* make sure controller is not busy anywhere */\n+\tret = wait_for_bit(__func__, &priv->regs->sr,\n+\t\t\t   QSPI_SR_BUSY_MASK |\n+\t\t\t   QSPI_SR_AHB_ACC_MASK |\n+\t\t\t   QSPI_SR_IP_ACC_MASK,\n+\t\t\t   false, 100, false);\n+\n+\tif (ret) {\n+\t\tdebug(\"ERROR : The controller is busy\\n\");\n+\t\treturn ret;\n+\t}\n+\n \tpriv->cur_amba_base = priv->amba_base[slave_plat->cs];\n \n \tqspi_module_disable(priv, 0);\ndiff --git a/drivers/spi/fsl_qspi.h b/drivers/spi/fsl_qspi.h\nindex 6cb3610..e468eb2 100644\n--- a/drivers/spi/fsl_qspi.h\n+++ b/drivers/spi/fsl_qspi.h\n@@ -105,6 +105,10 @@ struct fsl_qspi_regs {\n #define QSPI_RBCT_RXBRD_SHIFT\t\t8\n #define QSPI_RBCT_RXBRD_USEIPS\t\t(1 << QSPI_RBCT_RXBRD_SHIFT)\n \n+#define QSPI_SR_AHB_ACC_SHIFT\t\t2\n+#define QSPI_SR_AHB_ACC_MASK\t\t(1 << QSPI_SR_AHB_ACC_SHIFT)\n+#define QSPI_SR_IP_ACC_SHIFT\t\t1\n+#define QSPI_SR_IP_ACC_MASK\t\t(1 << QSPI_SR_IP_ACC_SHIFT)\n #define QSPI_SR_BUSY_SHIFT\t\t0\n #define QSPI_SR_BUSY_MASK\t\t(1 << QSPI_SR_BUSY_SHIFT)\n \n",
    "prefixes": [
        "U-Boot",
        "v4"
    ]
}