linux-kernel - [PATCH 3/5] mmc: mtk-sd: Take action for no-sdio device-tree parameter

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Message-Id: <20211216125748.179602-3-angelogioacchino.delregno@collabora.com>
Date:   Thu, 16 Dec 2021 13:57:46 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     chaotian.jing@...iatek.com
Cc:     ulf.hansson@...aro.org, matthias.bgg@...il.com,
        linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: [PATCH 3/5] mmc: mtk-sd: Take action for no-sdio device-tree parameter

This driver was unconditionally enabling support for SDIO mode,
but we do have a generic "no-sdio" DT parameter that sets caps2
MMC_CAP2_NO_SDIO.

Modify the HW initialization sequence to enable SDIO support only
if it hasn't been explicitly disabled in device-tree.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/mmc/host/mtk-sd.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index d067636434ca..f08695e52601 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -1638,6 +1638,7 @@ static void msdc_init_hw(struct msdc_host *host)
 {
 	u32 val;
 	u32 tune_reg = host->dev_comp->pad_tune_reg;
+	struct mmc_host *mmc = mmc_from_priv(host);
 
 	if (host->reset) {
 		reset_control_assert(host->reset);
@@ -1743,14 +1744,18 @@ static void msdc_init_hw(struct msdc_host *host)
 				     MSDC_PAD_TUNE_RXDLYSEL);
 	}
 
-	/* Configure to enable SDIO mode.
-	 * it's must otherwise sdio cmd5 failed
-	 */
-	sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIO);
+	if (mmc->caps2 & MMC_CAP2_NO_SDIO) {
+		sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIO);
+		sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
+		sdr_clr_bits(host->base + SDC_ADV_CFG0, SDC_DAT1_IRQ_TRIGGER);
+	} else {
+		/* Configure to enable SDIO mode, otherwise SDIO CMD5 fails */
+		sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIO);
 
-	/* Config SDIO device detect interrupt function */
-	sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
-	sdr_set_bits(host->base + SDC_ADV_CFG0, SDC_DAT1_IRQ_TRIGGER);
+		/* Config SDIO device detect interrupt function */
+		sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
+		sdr_set_bits(host->base + SDC_ADV_CFG0, SDC_DAT1_IRQ_TRIGGER);
+	}
 
 	/* Configure to default data timeout */
 	sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, 3);
-- 
2.33.1