Skip to content

L
linux-davinci
Switch branch/tag
  1. 29 Jan, 2009 2 commits
    • Juha Yrjola's avatar
      ARM: OMAP: Fix race in OMAP2/3 DMA IRQ handling · 320ce6f6
      Juha Yrjola authored 
      CSR must be cleared before invoking the callback.

If the callback function starts a new, fast DMA transfer on the same
channel, the completion status might lost if CSR is cleared after
the callback invocation.
Signed-off-by: default avatarJuha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
      320ce6f6
    • Stanley.Miao's avatar
      ARM: OMAP: Fix McBSP spin_lock deadlock · 06151158
      Stanley.Miao authored 
      A spin_lock deadlock will occur when omap_mcbsp_request() is invoked.

omap_mcbsp_request()
\- clk_enable(mcbsp->clk)         [takes and holds clockfw_lock]
    \- omap2_clk_enable()
       \- _omap2_clk_enable()
           \- omap_mcbsp_clk_enable()
              \- clk_enable(child clock)   [tries for clockfw_lock again]

mcbsp_clk is a virtual clock and it comprises several child clocks. when
enable mcbsp_clk in omap_mcbsp_request(), the enable function of mcbsp_clk
will enable its child clocks, then the deadlock occurs.

The solution is to remove the virtual clock and enable these child clocks in
omap_mcbsp_request() directly.
Signed-off-by: default avatarStanley.Miao <stanley.miao@windriver.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
      06151158
  3. 28 Jan, 2009 38 commits