[U-Boot] [PATCH 18/33] mmc: dw_mmc: add the support for the tuning scheme

[Ziyuan Xu]

For the HS200/HS400/SDR104, tuning is needed to determine the optimal
sampling point. Actual tuning procedure is provided by specific host
controller driver.

Signed-off-by: Ziyuan Xu <xzy.xu at rock-chips.com>
---

 drivers/mmc/dw_mmc.c | 18 ++++++++++++++++++
 include/dwmmc.h      |  1 +
 2 files changed, 19 insertions(+)

diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 7e9ffc2..c05288c 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -404,6 +404,22 @@ static bool dwmci_card_busy(struct mmc *mmc)
 }
 
 #ifdef CONFIG_DM_MMC_OPS
+static int dwmci_execute_tuning(struct udevice *dev, u32 opcode)
+{
+	struct mmc *mmc = mmc_get_mmc_dev(dev);
+#else
+static int dwmci_execute_tuning(struct mmc *mmc, u32 opcode)
+{
+#endif
+	struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
+
+	if (!host->execute_tuning)
+		return -EIO;
+
+	return host->execute_tuning(host, opcode);
+}
+
+#ifdef CONFIG_DM_MMC_OPS
 static int dwmci_set_ios(struct udevice *dev)
 {
 	struct mmc *mmc = mmc_get_mmc_dev(dev);
@@ -498,6 +514,7 @@ const struct dm_mmc_ops dm_dwmci_ops = {
 	.card_busy	= dwmci_card_busy,
 	.send_cmd	= dwmci_send_cmd,
 	.set_ios	= dwmci_set_ios,
+	.execute_tuning	= dwmci_execute_tuning,
 };
 
 #else
@@ -506,6 +523,7 @@ static const struct mmc_ops dwmci_ops = {
 	.send_cmd	= dwmci_send_cmd,
 	.set_ios	= dwmci_set_ios,
 	.init		= dwmci_init,
+	.execute_tuning	= dwmci_execute_tuning,
 };
 #endif
 
diff --git a/include/dwmmc.h b/include/dwmmc.h
index 4dda009..95be7c2 100644
--- a/include/dwmmc.h
+++ b/include/dwmmc.h
@@ -180,6 +180,7 @@ struct dwmci_host {
 	 * @freq:	Frequency the host is trying to achieve
 	 */
 	unsigned int (*get_mmc_clk)(struct dwmci_host *host, uint freq);
+	int (*execute_tuning)(struct dwmci_host *host, u32 opcode);
 #ifndef CONFIG_BLK
 	struct mmc_config cfg;
 #endif
-- 
2.7.4