mmc: msm_sdcc: Add prog done interrupt support

Enable prog done interrupt for stop command(CMD12) that is sent
after a multi-block write(CMD25). The PROG_DONE bit is set when
the card has finished its programming and is ready for next data.

After every write request the card will be polled for ready status
using CMD13. For a multi-block write(CMD25) before sending CMD13,
stop command (CMD12) will be sent.  If we enable prog done interrupt
for CMD12, then CMD13 polling can be avoided. The prog done interrupt
means that the card is done with its programming and is ready for
next request.

Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>

1 files changed, 25 insertions, 3 deletions

diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c
index b147971a96e..67f536ca31d 100644
--- a/drivers/mmc/host/msm_sdcc.c
+++ b/drivers/mmc/host/msm_sdcc.c
@@ -438,6 +438,11 @@ msmsdcc_start_command_deferred(struct msmsdcc_host *host,
 	      (cmd->opcode == 53))
 		*c |= MCI_CSPM_DATCMD;
 
+	if (host->prog_scan && (cmd->opcode == 12)) {
+		*c |= MCI_CPSM_PROGENA;
+		host->prog_enable = true;
+	}
+
 	if (cmd == cmd->mrq->stop)
 		*c |= MCI_CSPM_MCIABORT;
 
@@ -508,6 +513,8 @@ msmsdcc_start_data(struct msmsdcc_host *host, struct mmc_data *data,
 			host->cmd_c = c;
 		}
 		msm_dmov_enqueue_cmd(host->dma.channel, &host->dma.hdr);
+		if (data->flags & MMC_DATA_WRITE)
+			host->prog_scan = true;
 	} else {
 		msmsdcc_writel(host, timeout, MMCIDATATIMER);
 
@@ -718,8 +725,23 @@ static void msmsdcc_do_cmdirq(struct msmsdcc_host *host, uint32_t status)
 		else if (host->curr.data) { /* Non DMA */
 			msmsdcc_stop_data(host);
 			msmsdcc_request_end(host, cmd->mrq);
-		} else /* host->data == NULL */
-			msmsdcc_request_end(host, cmd->mrq);
+		} else { /* host->data == NULL */
+			if (!cmd->error && host->prog_enable) {
+				if (status & MCI_PROGDONE) {
+					host->prog_scan = false;
+					host->prog_enable = false;
+					msmsdcc_request_end(host, cmd->mrq);
+				} else {
+					host->curr.cmd = cmd;
+				}
+			} else {
+				if (host->prog_enable) {
+					host->prog_scan = false;
+					host->prog_enable = false;
+				}
+				msmsdcc_request_end(host, cmd->mrq);
+			}
+		}
 	} else if (cmd->data)
 		if (!(cmd->data->flags & MMC_DATA_READ))
 			msmsdcc_start_data(host, cmd->data,
@@ -733,7 +755,7 @@ msmsdcc_handle_irq_data(struct msmsdcc_host *host, u32 status,
 	struct mmc_data *data = host->curr.data;
 
 	if (status & (MCI_CMDSENT | MCI_CMDRESPEND | MCI_CMDCRCFAIL |
-	              MCI_CMDTIMEOUT) && host->curr.cmd) {
+			MCI_CMDTIMEOUT | MCI_PROGDONE) && host->curr.cmd) {
 		msmsdcc_do_cmdirq(host, status);
 	}