Commit 045d705d authored Feb 12, 2020 by Baolin Wang Committed by Ulf Hansson Mar 24, 2020

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.

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>

parent 511ce378

drivers/mmc/core/sd.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -1082,6 +1082,16 @@ retry:
		}
		}

		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",