mmc: meson-gx: factor out setting block size

Factor out setting the block size. This also contributes to reducing
complexity of function meson_mmc_start_cmd.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/meson-gx-mmc.c

@@ -431,12 +431,36 @@ static void meson_mmc_request_done(struct mmc_host *mmc,
 	mmc_request_done(host->mmc, mrq);
 }
 
+static void meson_mmc_set_blksz(struct mmc_host *mmc, unsigned int blksz)
+{
+	struct meson_host *host = mmc_priv(mmc);
+	u32 cfg, blksz_old;
+
+	cfg = readl(host->regs + SD_EMMC_CFG);
+	blksz_old = FIELD_GET(CFG_BLK_LEN_MASK, cfg);
+
+	if (!is_power_of_2(blksz))
+		dev_err(host->dev, "blksz %u is not a power of 2\n", blksz);
+
+	blksz = ilog2(blksz);
+
+	/* check if block-size matches, if not update */
+	if (blksz == blksz_old)
+		return;
+
+	dev_dbg(host->dev, "%s: update blk_len %d -> %d\n", __func__,
+		blksz_old, blksz);
+
+	cfg &= ~CFG_BLK_LEN_MASK;
+	cfg |= FIELD_PREP(CFG_BLK_LEN_MASK, blksz);
+	writel(cfg, host->regs + SD_EMMC_CFG);
+}
+
 static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
 {
 	struct meson_host *host = mmc_priv(mmc);
 	struct mmc_data *data = cmd->data;
-	u32 cfg, cmd_cfg = 0, cmd_data = 0;
-	u8 blk_len;
+	u32 cmd_cfg = 0, cmd_data = 0;
 	unsigned int xfer_bytes = 0;
 
 	/* Setup descriptors */
@@ -470,19 +494,7 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
 			cmd_cfg |= CMD_CFG_BLOCK_MODE;
 			cmd_cfg |= FIELD_PREP(CMD_CFG_LENGTH_MASK,
 					      data->blocks);
-
-			/* check if block-size matches, if not update */
-			cfg = readl(host->regs + SD_EMMC_CFG);
-			blk_len = FIELD_GET(CFG_BLK_LEN_MASK, cfg);
-			if (blk_len != ilog2(data->blksz)) {
-				dev_dbg(host->dev, "%s: update blk_len %d -> %d\n",
-					__func__, blk_len,
-					ilog2(data->blksz));
-				blk_len = ilog2(data->blksz);
-				cfg &= ~CFG_BLK_LEN_MASK;
-				cfg |= FIELD_PREP(CFG_BLK_LEN_MASK, blk_len);
-				writel(cfg, host->regs + SD_EMMC_CFG);
-			}
+			meson_mmc_set_blksz(mmc, data->blksz);
 		} else {
 			cmd_cfg |= FIELD_PREP(CMD_CFG_LENGTH_MASK, data->blksz);
 		}