mmc: sdhci: remove mdelay in eMMC tuning

This patch removes an unneccesary 1ms mdelay in the HS200 tuning
loop, called 40 times per retuning. Currently this causes a latency
of >40ms on any emmc accesses triggering wake from runtime PM,
which can occur for a significant portion of reads on a mostly idle system.

The delay is left in place for SD Cards, which use
MMC_SEND_TUNING_BLOCK rather than MMC_SEND_TUNING_BLOCK_HS200.
I'm not able to find evidence that this is required for SD in the
specs I have access to, however this delay has been present from
initial checkin for SD so I have preserved the original behavior for
compatibility.

This has been verified to fix observed glitching on local audio
playback and recording on apps with inbuilt assumptions on storage
latency.

Signed-off-by: Nick Sanders <[e-mail]>
Reviewed-by: Grant Grundler <[e-mail]>
Reviewed-by: Doug Anderson <[e-mail]>
Acked-by: Ulf Hansson <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>

drivers/mmc/host/sdhci.c

···
 		ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 		tuning_loop_counter--;
 		timeout--;
-		mdelay(1);
+
+		/* eMMC spec does not require a delay between tuning cycles */
+		if (opcode == MMC_SEND_TUNING_BLOCK)
+			mdelay(1);
 	} while (ctrl & SDHCI_CTRL_EXEC_TUNING);
 
 	/*