mmc: sd: HACK add module parameter to allow CQ write depth modification

Needed for comparative testing.

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>

Author: P33M

drivers/mmc/core/core.c

@@ -61,6 +61,9 @@ static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
 bool use_spi_crc = 1;
 module_param(use_spi_crc, bool, 0);
 
+uint max_posted_writes = 31;
+module_param(max_posted_writes, uint, 0644);
+
 static int mmc_schedule_delayed_work(struct delayed_work *work,
 				     unsigned long delay)
 {

drivers/mmc/core/core.h

@@ -84,6 +84,7 @@ int mmc_attach_sdio(struct mmc_host *host);
 
 /* Module parameters */
 extern bool use_spi_crc;
+extern uint max_posted_writes;
 
 /* Debugfs information for hosts and cards */
 #ifdef CONFIG_DEBUG_FS

drivers/mmc/core/sd.c

@@ -1124,6 +1124,8 @@ static int sd_parse_ext_reg_perf(struct mmc_card *card, u8 fno, u8 page,
 		 */
 		if (!mmc_card_is_removable(card->host))
 			card->max_posted_writes = card->ext_csd.cmdq_depth;
+		else
+			card->max_posted_writes = min_t(uint, card->max_posted_writes, card->ext_csd.cmdq_depth);
 	}
 
 	card->ext_perf.fno = fno;
@@ -1407,7 +1409,7 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 
 		card->ocr = ocr;
 		card->type = MMC_TYPE_SD;
-		card->max_posted_writes = 1;
+		card->max_posted_writes = max_posted_writes;
 		memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
 	}