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GET /api/patches/1378396/?format=api
{ "id": 1378396, "url": "http://patchwork.ozlabs.org/api/patches/1378396/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/patch/20201008051250.25784-9-faiz_abbas@ti.com/", "project": { "id": 18, "url": "http://patchwork.ozlabs.org/api/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, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20201008051250.25784-9-faiz_abbas@ti.com>", "list_archive_url": null, "date": "2020-10-08T05:12:41", "name": "[08/17] mmc: am654_sdhci: Add support for software tuning", "commit_ref": null, "pull_url": null, "state": "changes-requested", "archived": false, "hash": "9c3b3b754f94ccb8aaed05a645c67d4f923343ae", "submitter": { "id": 72140, "url": "http://patchwork.ozlabs.org/api/people/72140/?format=api", "name": "Faiz Abbas", "email": "faiz_abbas@ti.com" }, "delegate": { "id": 19261, "url": "http://patchwork.ozlabs.org/api/users/19261/?format=api", "username": "lokeshvutla", "first_name": "Lokesh", "last_name": "Vutla", "email": "lokeshvutla@ti.com" }, "mbox": "http://patchwork.ozlabs.org/project/uboot/patch/20201008051250.25784-9-faiz_abbas@ti.com/mbox/", "series": [ { "id": 206622, "url": "http://patchwork.ozlabs.org/api/series/206622/?format=api", "web_url": "http://patchwork.ozlabs.org/project/uboot/list/?series=206622", "date": "2020-10-08T05:12:33", "name": "Add support for MMC higher speed modes for TI's am65x, j721e and j7200 platforms", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/206622/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/1378396/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/1378396/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<u-boot-bounces@lists.denx.de>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org", "Authentication-Results": [ "ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=2a01:238:438b:c500:173d:9f52:ddab:ee01; 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Thu, 8 Oct\n 2020 00:13:29 -0500", "from lelv0327.itg.ti.com (10.180.67.183) by DFLE108.ent.ti.com\n (10.64.6.29) with Microsoft SMTP Server (version=TLS1_2,\n cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3 via\n Frontend Transport; Thu, 8 Oct 2020 00:13:29 -0500", "from a0230074-Latitude-E7470.ent.ti.com (ileax41-snat.itg.ti.com\n [10.172.224.153])\n by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 0985Cpxk022642;\n Thu, 8 Oct 2020 00:13:27 -0500" ], "X-Spam-Checker-Version": "SpamAssassin 3.4.2 (2018-09-13) on phobos.denx.de", "X-Spam-Level": "", "X-Spam-Status": "No, score=-2.7 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,\n DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,SPF_HELO_NONE,URIBL_BLOCKED\n autolearn=ham autolearn_force=no version=3.4.2", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com;\n s=ti-com-17Q1; t=1602134010;\n bh=t8/fjIL3rg9gycJV0e4v5/6TeMNANoHzlFy6clTnx2Q=;\n h=From:To:CC:Subject:Date:In-Reply-To:References;\n b=Mg/tiKb5wR7wd532xuxUCF7CZUczkkm5+I9y0/SPNsxfcYESRlc/8l6xL4WFK4z0Y\n 1Fwu/sy8Qmyu5bpxOIB2RBiqMWdGMQw27oNsDorgFj/lZKGDf88B38XfBdedTHRKLN\n VIGs1/AcjrWlGgZfm1ilDrxxLZ2uF+9lE9C/Q3gw=", "From": "Faiz Abbas <faiz_abbas@ti.com>", "To": "<u-boot@lists.denx.de>, <peng.fan@nxp.com>, <lokeshvutla@ti.com>", "CC": "<faiz_abbas@ti.com>", "Subject": "[PATCH 08/17] mmc: am654_sdhci: Add support for software tuning", "Date": "Thu, 8 Oct 2020 10:42:41 +0530", "Message-ID": "<20201008051250.25784-9-faiz_abbas@ti.com>", "X-Mailer": "git-send-email 2.17.1", "In-Reply-To": "<20201008051250.25784-1-faiz_abbas@ti.com>", "References": "<20201008051250.25784-1-faiz_abbas@ti.com>", "MIME-Version": "1.0", "Content-Type": "text/plain", "X-EXCLAIMER-MD-CONFIG": "e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180", "X-BeenThere": "u-boot@lists.denx.de", "X-Mailman-Version": "2.1.34", "Precedence": "list", "List-Id": "U-Boot discussion <u-boot.lists.denx.de>", "List-Unsubscribe": "<https://lists.denx.de/options/u-boot>,\n <mailto:u-boot-request@lists.denx.de?subject=unsubscribe>", "List-Archive": "<https://lists.denx.de/pipermail/u-boot/>", "List-Post": "<mailto:u-boot@lists.denx.de>", "List-Help": "<mailto:u-boot-request@lists.denx.de?subject=help>", "List-Subscribe": "<https://lists.denx.de/listinfo/u-boot>,\n <mailto:u-boot-request@lists.denx.de?subject=subscribe>", "Errors-To": "u-boot-bounces@lists.denx.de", "Sender": "\"U-Boot\" <u-boot-bounces@lists.denx.de>", "X-Virus-Scanned": "clamav-milter 0.102.3 at phobos.denx.de", "X-Virus-Status": "Clean" }, "content": "With the new SW tuning App note[1], a custom tuning algorithm is\nrequired for eMMC HS200, HS400 and SD card UHS modes. The algorithm\ninvolves running through the 32 possible input tap delay values and\nsending the appropriate tuning command (CMD19/21) for each of them\nto get a fail or pass result for each of the values. Typically, the\nrange will have a small contiguous failing window. Considering the\ntuning range as a circular buffer, the algorithm then sets a final\ntuned value directly opposite to the failing window.\n\n[1] https://www.ti.com/lit/pdf/spract9\n\nSigned-off-by: Faiz Abbas <faiz_abbas@ti.com>\n---\n drivers/mmc/am654_sdhci.c | 45 +++++++++++++++++++++++++++++++++++++++\n 1 file changed, 45 insertions(+)", "diff": "diff --git a/drivers/mmc/am654_sdhci.c b/drivers/mmc/am654_sdhci.c\nindex fa118fc56c..79b4331c3c 100644\n--- a/drivers/mmc/am654_sdhci.c\n+++ b/drivers/mmc/am654_sdhci.c\n@@ -9,6 +9,7 @@\n #include <common.h>\n #include <dm.h>\n #include <malloc.h>\n+#include <mmc.h>\n #include <power-domain.h>\n #include <regmap.h>\n #include <sdhci.h>\n@@ -368,7 +369,48 @@ static int am654_sdhci_deferred_probe(struct sdhci_host *host)\n \treturn sdhci_probe(dev);\n }\n \n+#ifdef MMC_SUPPORTS_TUNING\n+#define ITAP_MAX\t32\n+static int am654_sdhci_execute_tuning(struct mmc *mmc, u8 opcode)\n+{\n+\tstruct udevice *dev = mmc->dev;\n+\tstruct am654_sdhci_plat *plat = dev_get_platdata(dev);\n+\tint cur_val, prev_val = 1, fail_len = 0, pass_window = 0, pass_len;\n+\tu32 itap;\n+\n+\t/* Enable ITAPDLY */\n+\tregmap_update_bits(plat->base, PHY_CTRL4, ITAPDLYENA_MASK,\n+\t\t\t 1 << ITAPDLYENA_SHIFT);\n+\n+\tfor (itap = 0; itap < ITAP_MAX; itap++) {\n+\t\tam654_sdhci_write_itapdly(plat, itap);\n+\n+\t\tcur_val = !mmc_send_tuning(mmc, opcode, NULL);\n+\t\tif (cur_val && !prev_val)\n+\t\t\tpass_window = itap;\n+\n+\t\tif (!cur_val)\n+\t\t\tfail_len++;\n+\n+\t\tprev_val = cur_val;\n+\t}\n+\t/*\n+\t * Having determined the length of the failing window and start of\n+\t * the passing window calculate the length of the passing window and\n+\t * set the final value halfway through it considering the range as a\n+\t * circular buffer\n+\t */\n+\tpass_len = ITAP_MAX - fail_len;\n+\titap = (pass_window + (pass_len >> 1)) % ITAP_MAX;\n+\tam654_sdhci_write_itapdly(plat, itap);\n+\n+\treturn 0;\n+}\n+#endif\n const struct sdhci_ops am654_sdhci_ops = {\n+#ifdef MMC_SUPPORTS_TUNING\n+\t.platform_execute_tuning = am654_sdhci_execute_tuning,\n+#endif\n \t.deferred_probe\t\t= am654_sdhci_deferred_probe,\n \t.set_ios_post\t\t= &am654_sdhci_set_ios_post,\n \t.set_control_reg\t= &am654_sdhci_set_control_reg,\n@@ -408,6 +450,9 @@ static int j721e_4bit_sdhci_set_ios_post(struct sdhci_host *host)\n }\n \n const struct sdhci_ops j721e_4bit_sdhci_ops = {\n+#ifdef MMC_SUPPORTS_TUNING\n+\t.platform_execute_tuning = am654_sdhci_execute_tuning,\n+#endif\n \t.deferred_probe\t\t= am654_sdhci_deferred_probe,\n \t.set_ios_post\t\t= &j721e_4bit_sdhci_set_ios_post,\n };\n", "prefixes": [ "08/17" ] }