[PATCH 17/45] dm: mmc: Allow sandbox emulator to build without writes

[Simon Glass]

When MMC_WRITE is disabled this driver produced a build error. Fix this.

Also update a comment while we are here.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 drivers/mmc/sandbox_mmc.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/sandbox_mmc.c b/drivers/mmc/sandbox_mmc.c
index 451fe4a4e5a..ba79a5565c3 100644
--- a/drivers/mmc/sandbox_mmc.c
+++ b/drivers/mmc/sandbox_mmc.c
@@ -23,6 +23,8 @@ struct sandbox_mmc_plat {
 #define MMC_CMULT		8 /* 8 because the card is high-capacity */
 #define MMC_BL_LEN_SHIFT	10
 #define MMC_BL_LEN		BIT(MMC_BL_LEN_SHIFT)
+
+/* Granularity of priv->csize - this is 1MB */
 #define SIZE_MULTIPLE		((1 << (MMC_CMULT + 2)) * MMC_BL_LEN)
 
 struct sandbox_mmc_priv {
@@ -41,7 +43,6 @@ static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
 				struct mmc_data *data)
 {
 	struct sandbox_mmc_priv *priv = dev_get_priv(dev);
-	struct mmc *mmc = mmc_get_mmc_dev(dev);
 	static ulong erase_start, erase_end;
 
 	switch (cmd->cmdidx) {
@@ -95,10 +96,15 @@ static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
 	case SD_CMD_ERASE_WR_BLK_END:
 		erase_end = cmd->cmdarg;
 		break;
-	case MMC_CMD_ERASE:
+#if CONFIG_IS_ENABLED(MMC_WRITE)
+	case MMC_CMD_ERASE: {
+		struct mmc *mmc = mmc_get_mmc_dev(dev);
+
 		memset(&priv->buf[erase_start * mmc->write_bl_len], '\0',
 		       (erase_end - erase_start + 1) * mmc->write_bl_len);
 		break;
+	}
+#endif
 	case SD_CMD_APP_SEND_OP_COND:
 		cmd->response[0] = OCR_BUSY | OCR_HCS;
 		cmd->response[1] = 0;
-- 
2.37.3.998.g577e59143f-goog