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Commit cd9ba685 authored by Dov Levenglick's avatar Dov Levenglick
Browse files

mmc: sdhci-msm: add support for multiple qos configurations 



Add support for multiple configurations of setting pm_qos
and have all pm_qos handled from the sdhci-msm driver.
This is used in order to support different hardware
architectures (cpu-to-cluster mapping), different pm_qos
requirements for read/write accesses or to compensate for
different scheduler schemes.

Signed-off-by: default avatarDov Levenglick <dovl@codeaurora.org>
Change-Id: I1770ec7dcb35000b64faff0592dd6d81ca2b265c
parent 67965eb2

Documentation/devicetree/bindings/mmc/sdhci-msm.txt

+40 −7
Original line number Diff line number Diff line
@@ -58,9 +58,34 @@ Optional Properties: 
				"HS200_1p2v" - indicates that host can support HS200 at 1.2v.

				"DDR_1p8v" - indicates that host can support DDR mode at 1.8v.

				"DDR_1p2v" - indicates that host can support DDR mode at 1.2v.

	- qcom,num-pm-qos-configs: allows for multiple configurations of pm_qos. if

				not provided, defaults to 1.

	- qcom,pm-qos-rw-policy: an array of strings the size of

				qcom,num-pm-qos-configs. legal values are "rw", "r" or "w"

				which indicate whether this configuration is specific to read

				or to write accesses. if not provided at all - all

				configurations default to "rw"

	- qcom,default-rd-pm-qos: default pm_qos configuration for read

				request. contains a string of numeric value (e.g. "1") or "cpu".

				if equals "cpu", if can't find exact match for read request

				in other configurations, searches again while ignoring

				qcom,pm-qos-rw-policy.

				if equals numeric value, must be less than

				qcom,num-pm-qos-configs. if not provided, defaults to "0".

	- qcom,default-wr-pm-qos: default pm_qos configuration for write

				request. contains a string of numeric value (e.g. "1") or "cpu".

				if equals "cpu", if can't find exact match for read request

				in other configurations, searches again while ignoring

				qcom,pm-qos-rw-policy.

				if equals numeric value, must be less than

				qcom,num-pm-qos-configs. if not provided, defaults to "0".

	- qcom,cpu-dma-latency-us: specifies acceptable DMA latency in microseconds.

				Default value is 200 ms. If this property specified as 0,

				then SDHC driver will not vote for PM QOS.

				Default value is 200 us. The value for each configuration can

				either be a single value or an array of 3 values corresponding

				to {SDHCI_PERFORMANCE_MODE, SDHCI_PERFORMANCE_MODE_INIT,

				SDHCI_POWER_SAVE_MODE}. If qcom,num-pm-qos-configs is larger

				than 1, provide multiple arrays - each must have the size of 3

				(although they may be duplicated values).

        - qcom,dat1-mpm-int:    specifies MPM interrupt number (e.g. sdhc_2 node below)

				corresponding to DAT1 line of SDHC (used only if slot has dedicated

				DAT1 MSM pin (not GPIO))
@@ -114,10 +139,14 @@ In the following, <supply> can be vdd (flash core voltage) or vdd-io (I/O voltag 
	  all the cores in the little cluster.

	  The default CPU affinity mode is PM_QOS_REQ_AFFINE_IRQ to maintain

	  backward compatibility.

	  If qcom,num-pm-qos-configs is larger than 1, provide an array of strings.



	- qcom,cpu-affinity-mask: this is a bitmap that specifies little cluster CPU

	  cores used for PM QoS voting. This is parsed only for pm QoS request type of

	- qcom,cpu-affinity-mask: this is a bitmap that specifies the CPU cores used

	  for PM QoS voting. This is parsed only for pm QoS request type of

	  PM_QOS_REQ_AFFINE_CORES ("affine_cores").

	  If qcom,num-pm-qos-configs is larger than 1, provide an array of masks.

	  The values corresponding to configurations for which qcom,cpu-affinity is

	  not "affine_cores" will be ignored.



Example:
@@ -149,9 +178,13 @@ Example: 




                qcom,bus-width = <4>;

		qcom,cpu-dma-latency-us = <301>;

		qcom,cpu-affinity = "affine_cores";

		qcom,cpu-affinity-mask = <0x0f>;

		qcom,num-pm-qos-configs = <2>;

		qcom,default-rd-pm-qos-config = "0";

		qcom,default-wr-pm-qos-config = "cpu";

		qcom,pm-qos-rw-policy = "r", "w";

		qcom,cpu-dma-latency-us = <201 301 701>, <301 301 301>;

		qcom,cpu-affinity = "affine_cores", "irq";

		qcom,cpu-affinity-mask = <0x0f 0>;



		qcom,nonremovable;

		qcom,bus-speed-mode = "HS200_1p8v", "DDR_1p8v";