mmc: renesas_sdhi_internal_dmac: remove superfluous WARN

The WARN can never trigger because we limited the max_seg number in
renesas_sdhi_of_data already. Remove it and update the comment.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/renesas_sdhi_internal_dmac.c

@@ -91,7 +91,7 @@ static const struct renesas_sdhi_of_data of_rcar_gen3_compatible = {
 	.scc_offset	= 0x1000,
 	.taps		= rcar_gen3_scc_taps,
 	.taps_num	= ARRAY_SIZE(rcar_gen3_scc_taps),
-	/* Gen3 SDHI DMAC can handle 0xffffffff blk count, but seg = 1 */
+	/* DMAC can handle 0xffffffff blk count but only 1 segment */
 	.max_blk_count	= 0xffffffff,
 	.max_segs	= 1,
 };
@@ -158,9 +158,6 @@ renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host,
 	struct scatterlist *sg = host->sg_ptr;
 	u32 dtran_mode = DTRAN_MODE_BUS_WID_TH | DTRAN_MODE_ADDR_MODE;
 
-	/* This DMAC cannot handle if sg_len is not 1 */
-	WARN_ON(host->sg_len > 1);
-
 	if (!dma_map_sg(&host->pdev->dev, sg, host->sg_len,
 			mmc_get_dma_dir(data)))
 		goto force_pio;