staging: mt7621-mmc: Remove transfer mode setting from proc

Currently the transfer mode can be chosen between DMA, a size
dependent mode and non-DMA by writing to a proc file. The upstream
driver mtk-sd uses DMA all times.

There is no apparent reason why somebody would like to change the
transfer mode and the position of the setting in the debug part of the
driver also indicates, that the option was used for debugging
purposes. So it is removed to clean up the driver and bring it more in
line with the upstream one.
Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/dbg.c

@@ -286,21 +286,6 @@ static ssize_t msdc_debug_proc_write(struct file *file,
 		} else {
 			printk("msdc host_id error when set debug zone\n");
 		}
-	} else if (cmd == SD_TOOL_DMA_SIZE) {
-		id = p1 >> 4;
-		mode = (p1 & 0xf);
-		size = p2;
-		if (id >= 0 && id <= 3) {
-			drv_mode[id] = mode;
-			dma_size[id] = p2;
-		} else if (id == 4) {
-			drv_mode[0] = drv_mode[1] = mode;
-			drv_mode[2] = drv_mode[3] = mode;
-			dma_size[0] = dma_size[1] = p2;
-			dma_size[2] = dma_size[3] = p2;
-		} else {
-			printk("msdc host_id error when select mode\n");
-		}
 	} else if (cmd == SD_TOOL_SDIO_PROFILE) {
 		if (p1 == 1) { /* enable profile */
 			if (gpt_enable == 0) {