Commit 450745e4 authored Jul 24, 2014 by Venkat Gopalakrishnan Committed by Xiaonian Wang Apr 07, 2017

mmc: sdhci-msm: Reduce the max descriptors



8K is the max descriptors supported by the hardware per transfer.
On normal use cases we never use that many descriptors even if
the memory is extremely fragmented. The memory allocated for these
descriptors are never freed hence wasting memory otherwise
available for the system. Reduce the max descriptors to 512 to save
memory (128K with 8K descriptors vs 8K with 512 descriptors) and
still support maximum performance.

CRs-fixed: 684185
Change-Id: Ib57ce03834d741c0fda4195a58d6b287ee9fb0a0
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>

parent a71fbae8

drivers/mmc/host/sdhci-msm.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -156,8 +156,8 @@
		#define CORE_TESTBUS_SEL2_BIT 4
		#define CORE_TESTBUS_SEL2 (1 << CORE_TESTBUS_SEL2_BIT)

		/* 8KB descriptors */
		#define SDHCI_MSM_MAX_SEGMENTS (1 << 13)
		/* 512 descriptors */
		#define SDHCI_MSM_MAX_SEGMENTS (1 << 9)
		#define SDHCI_MSM_MMC_CLK_GATE_DELAY 200 /* msecs */

		#define CORE_FREQ_100MHZ (100 * 1000 * 1000)