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SDIO power on/off time impacts system suspend/resume time! - SFO17-402

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Session ID: SFO17-402
Session Name: SDIO power on/off time impacts system suspend/resume time! - SFO17-402
Speaker: Ulf Hansson

Track: Power Management


★ Session Summary ★
Often an embedded WLAN chip is connected via an SDIO bus. During a system suspend/resume the SDIO card (WLAN chip) gets re-initialized unconditionally, even when it’s not needed.

The re-initialization of an SDIO card often consumes several hundreds of milliseconds, as also shown by real measurements. Unfortunate this time adds up to the total suspend/resume time for the system.

In this session the problem is being described and a solution being explored.
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★ Resources ★
Event Page: http://connect.linaro.org/resource/sfo17/sfo17-402/
Presentation: https://www.slideshare.net/linaroorg/sdio-power-onoff-time-impacts-system-suspendresume-time-sfo17402
Video: https://www.youtube.com/watch?v=ikM0iXDyC8k
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★ Event Details ★
Linaro Connect San Francisco 2017 (SFO17)
25-29 September 2017
Hyatt Regency San Francisco Airport

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Keyword:
'http://www.linaro.org'
'http://connect.linaro.org'
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Published in: Technology
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SDIO power on/off time impacts system suspend/resume time! - SFO17-402

  1. 1. ENGINEERS AND DEVICES WORKING TOGETHER ● ● ● ●
  2. 2. ENGINEERS AND DEVICES WORKING TOGETHER ● ●
  3. 3. ENGINEERS AND DEVICES WORKING TOGETHER ● ● ● ● ● SDIO Controller SDIO CARD (WiFi) CLK CMD DAT[3:0 ]
  4. 4. ENGINEERS AND DEVICES WORKING TOGETHER ● ● ● ● ●
  5. 5. ENGINEERS AND DEVICES WORKING TOGETHER ● ● ○ ○ ● ● ○ ○
  6. 6. ENGINEERS AND DEVICES WORKING TOGETHER
  7. 7. ENGINEERS AND DEVICES WORKING TOGETHER ● ● ●
  8. 8. ENGINEERS AND DEVICES WORKING TOGETHER ● ● ○ ○ ● ○ ○ ●
  9. 9. ENGINEERS AND DEVICES WORKING TOGETHER ● ● ● ●
  10. 10. ENGINEERS AND DEVICES WORKING TOGETHER SDIO Controller SDIO CARD (WiFi) CLK CMD DAT[3:0 ] GPIO IRQ
  11. 11. ENGINEERS AND DEVICES WORKING TOGETHER ● ○ ○ ● ○ ○
  12. 12. ENGINEERS AND DEVICES WORKING TOGETHER ● ● ● ● ● ● ● ●
  13. 13. ENGINEERS AND DEVICES WORKING TOGETHER MMC CORE HOST DRIVER MMC BLOCK DEVICE DRIVER SDIO FUNC DRIVER (WIFI) SDIO BUSMMC BUS EMMC DEVICE SD DEVICE SDIO DEVICE SDIO FUNC DEVICE parent HOST BUS HOST DEVICE
  14. 14. ENGINEERS AND DEVICES WORKING TOGETHER ● ● ●

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