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Fri, 23 Dec 2022 02:50:06 +0000 From: haibo.chen@nxp.com To: ulf.hansson@linaro.org, adrian.hunter@intel.com Cc: shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, linux-mmc@vger.kernel.org, kgroeneveld@lenbrook.com, haibo.chen@nxp.com Subject: [PATCH v3 2/2] mmc: sdhci-esdhc-imx: only enable DAT[0] and CMD line auto tuning for SDIO device Date: Fri, 23 Dec 2022 10:50:22 +0800 Message-Id: <20221223025022.1893102-3-haibo.chen@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221223025022.1893102-1-haibo.chen@nxp.com> References: <20221223025022.1893102-1-haibo.chen@nxp.com> X-ClientProxiedBy: SI2PR02CA0008.apcprd02.prod.outlook.com (2603:1096:4:194::12) To DB7PR04MB4010.eurprd04.prod.outlook.com (2603:10a6:5:21::30) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DB7PR04MB4010:EE_|PA4PR04MB7709:EE_ X-MS-Office365-Filtering-Correlation-Id: 13e811dd-925b-43a5-76cb-08dae49065ed X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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When sdio device use 4 data lines, async sdio interrupt will use the shared DAT[1], if enable auto tuning circuit to check these 4 data lines, include the DAT[1], this circuit will detect this interrupt, take this as data on DAT[1], and adjust the delay cell wrongly, finally will cause the DATA/CMD CRC error. So for SDIO device, only enable DAT[0] and CMD line for auto tuning. To distinguish the card type during card init, involve init_card(). Signed-off-by: Haibo Chen Acked-by: Adrian Hunter --- drivers/mmc/host/sdhci-esdhc-imx.c | 41 ++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index bf8d6f60a9ee..8f5ee5964396 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -337,6 +337,16 @@ struct pltfm_imx_data { struct clk *clk_ahb; struct clk *clk_per; unsigned int actual_clock; + + /* + * USDHC has one limition, require the SDIO device a different + * register setting. Driver has to recognize card type during + * the card init, but at this stage, mmc_host->card is not + * available. So involve this field to save the card type + * during card init through usdhc_init_card(). + */ + unsigned int init_card_type; + enum { NO_CMD_PENDING, /* no multiblock command pending */ MULTIBLK_IN_PROCESS, /* exact multiblock cmd in process */ @@ -431,6 +441,8 @@ static inline void esdhc_wait_for_card_clock_gate_off(struct sdhci_host *host) /* Enable the auto tuning circuit to check the CMD line and BUS line */ static inline void usdhc_auto_tuning_mode_sel_and_en(struct sdhci_host *host) { + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host); u32 buswidth, auto_tune_buswidth; u32 reg; @@ -448,6 +460,20 @@ static inline void usdhc_auto_tuning_mode_sel_and_en(struct sdhci_host *host) break; } + /* + * For USDHC, auto tuning circuit can not handle the async sdio + * device interrupt correctly. When sdio device use 4 data lines, + * async sdio interrupt will use the shared DAT[1], if enable auto + * tuning circuit check these 4 data lines, include the DAT[1], + * this circuit will detect this interrupt, take this as a data on + * DAT[1], and adjust the delay cell wrongly. + * This is the hardware design limitation, to avoid this, for sdio + * device, config the auto tuning circuit only check DAT[0] and CMD + * line. + */ + if (imx_data->init_card_type == MMC_TYPE_SDIO) + auto_tune_buswidth = ESDHC_VEND_SPEC2_AUTO_TUNE_1BIT_EN; + esdhc_clrset_le(host, ESDHC_VEND_SPEC2_AUTO_TUNE_MODE_MASK, auto_tune_buswidth | ESDHC_VEND_SPEC2_AUTO_TUNE_CMD_EN, ESDHC_VEND_SPEC2); @@ -1055,6 +1081,15 @@ static void esdhc_reset_tuning(struct sdhci_host *host) } } +static void usdhc_init_card(struct mmc_host *mmc, struct mmc_card *card) +{ + struct sdhci_host *host = mmc_priv(mmc); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host); + + imx_data->init_card_type = card->type; +} + static int usdhc_execute_tuning(struct mmc_host *mmc, u32 opcode) { struct sdhci_host *host = mmc_priv(mmc); @@ -1673,6 +1708,12 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev) * to replace the standard one in sdhci_ops. */ host->mmc_host_ops.execute_tuning = usdhc_execute_tuning; + + /* + * Link usdhc specific mmc_host_ops init card function, + * to distinguish the card type. + */ + host->mmc_host_ops.init_card = usdhc_init_card; } err = sdhci_esdhc_imx_probe_dt(pdev, host, imx_data);