Commit ddc6f87e authored Feb 12, 2020 by Baolin Wang Committed by Todd Kjos Apr 08, 2020

UPSTREAM: mmc: core: Enable the MMC host software queue for the SD card



Enable the MMC host software queue for the SD card if the host controller
supports the MMC host software queue.

On my Spreadtrum platform, I did not see any obvious performance changes
in 4K block size when changing to use hsq for the SD cards, I think the
reason is the SD card works at a low speed on my platform, and most of
time is spent in the hardware. But we can see some obvious improvements
when enabling the packed request based on hsq, that's why we still add hsq
support for the SD cards.

bug: 151514181
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Link: https://lore.kernel.org/r/0065b4631fef2d61c3b89d14a4ea4f2b7499ea56.1581478568.git.baolin.wang7@gmail.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
(cherry picked from commit 045d705dc1fba0d881fe22ad76ebe1b44647cdac)
Change-Id: Ib3a9b3b4363d168950981b0fb7c2cbaa4810dd00

parent f4cfdfa0

drivers/mmc/core/sd.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -1082,6 +1082,16 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
		}
		}

		if (host->cqe_ops && !host->cqe_enabled) {
		err = host->cqe_ops->cqe_enable(host, card);
		if (!err) {
		host->cqe_enabled = true;
		host->hsq_enabled = true;
		pr_info("%s: Host Software Queue enabled\n",
		mmc_hostname(host));
		}
		}

		if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
		host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
		pr_err("%s: Host failed to negotiate down from 3.3V\n",