path: root/Documentation
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authorMagnus Damm <>2011-08-24 22:38:43 +0200
committerRafael J. Wysocki <>2011-08-24 22:38:43 +0200
commit5c3f96b20954fd6932bcfb1a860fa1d8b5b22ab0 (patch)
treebb0337f626329bd4c6dc33dc773fc4a94eb636b1 /Documentation
parent5a50a01bf00c8191073fdf518e1af1e950ac3af5 (diff)
ARM: mach-shmobile: sh7372 LCDC1 suspend fix
Associate the HDMI clock together with LCDC1 on sh7372. Without this patch Suspend-to-RAM hangs on the boards AP4EVB and Mackerel. The code hangs in the LCDC driver where the software is waiting forever for the hardware to power down. By explicitly associating the HDMI clock with LCDC1 we can make sure the HDMI clock is enabled using Runtime PM whenever the driver is accessing the hardware. This HDMI and LCDC1 dependency is documented in the sh7372 data sheet. Older kernels did work as expected but the recently merged (3.1-rc) 794d78f drivers: sh: late disabling of clocks V2 introduced code to turn off clocks lacking software reference which happens to include the HDMI clock that is needed by LCDC1 to operate as expected. Signed-off-by: Magnus Damm <> Signed-off-by: Rafael J. Wysocki <>
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