diff mbox series

[v3,07/10] mmc: host: Add close-ended Ext memory addressing

Message ID 20240814072934.2559911-8-avri.altman@wdc.com
State Superseded
Headers show
Series Add SDUC Support | expand

Commit Message

Avri Altman Aug. 14, 2024, 7:29 a.m. UTC 
In a close-ended multi-block data transfer, CMD23 shall precede CMD22.
Handle that logic once the sbc is done.

Host drivers that handle their own sbc logic, e.g. bcm2835 etc. are out
of scope of this change.

Tested-by: Ricky WU <ricky_wu@realtek.com>
Signed-off-by: Avri Altman <avri.altman@wdc.com>
---
 drivers/mmc/host/sdhci.c | 34 ++++++++++++++++++++++++++++++----
 1 file changed, 30 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index f62b489c9e9c..75a91d0ed16a 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1791,9 +1791,36 @@  static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd)
 	}
 }
 
+static struct mmc_command *sdhci_get_sbc_ext(struct sdhci_host *host,
+					     struct mmc_command *cmd)
+{
+	if (mmc_card_is_sduc(host->mmc)) {
+		/*  Finished CMD22, now send actual command */
+		if (cmd == cmd->mrq->ext)
+			return cmd->mrq->cmd;
+	}
+
+	/* Finished CMD23 */
+	if (cmd == cmd->mrq->sbc) {
+		if (mmc_card_is_sduc(host->mmc)) {
+			/* send CMD22 after CMD23 */
+			if (WARN_ON(!cmd->mrq->ext))
+				return NULL;
+			else
+				return cmd->mrq->ext;
+		} else {
+			/* Finished CMD23, now send actual command */
+			return cmd->mrq->cmd;
+		}
+	}
+
+	return NULL;
+}
+
 static void sdhci_finish_command(struct sdhci_host *host)
 {
 	struct mmc_command *cmd = host->cmd;
+	struct mmc_command *sbc_ext = NULL;
 
 	host->cmd = NULL;
 
@@ -1828,14 +1855,13 @@  static void sdhci_finish_command(struct sdhci_host *host)
 		}
 	}
 
-	/* Finished CMD23, now send actual command. */
-	if (cmd == cmd->mrq->sbc) {
-		if (!sdhci_send_command(host, cmd->mrq->cmd)) {
+	sbc_ext = sdhci_get_sbc_ext(host, cmd);
+	if (sbc_ext) {
+		if (!sdhci_send_command(host, sbc_ext)) {
 			WARN_ON(host->deferred_cmd);
 			host->deferred_cmd = cmd->mrq->cmd;
 		}
 	} else {
-
 		/* Processed actual command. */
 		if (host->data && host->data_early)
 			sdhci_finish_data(host);