From 994d5375a246c6585d2a6751d568cc86e89aef34 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Tue, 1 Mar 2011 13:43:07 -0300 Subject: [PATCH] [media] omap3isp: isp: Reset the ISP when the pipeline can't be stopped When a failure to stop a module in the pipeline is detected, the only way to recover is to reset the ISP. However, as other users can be using a different pipeline with other modules, the ISP can't be reset synchronously with the error detection. Mark the ISP as needing a reset when a failure to stop a pipeline is detected, and reset the ISP when the last user releases the last reference to the ISP. Modify the omap3isp_pipeline_set_stream() function to record the new ISP pipeline state only when no error occurs, except when stopping the pipeline in which case the pipeline is still marked as stopped. Signed-off-by: Laurent Pinchart Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/omap3isp/isp.c | 14 ++++++++++++-- drivers/media/video/omap3isp/isp.h | 1 + 2 files changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/media/video/omap3isp/isp.c b/drivers/media/video/omap3isp/isp.c index 7d68b109d32f..f380f09b119c 100644 --- a/drivers/media/video/omap3isp/isp.c +++ b/drivers/media/video/omap3isp/isp.c @@ -872,6 +872,9 @@ static int isp_pipeline_disable(struct isp_pipeline *pipe) } } + if (failure < 0) + isp->needs_reset = true; + return failure; } @@ -884,7 +887,8 @@ static int isp_pipeline_disable(struct isp_pipeline *pipe) * single-shot or continuous mode. * * Return 0 if successful, or the return value of the failed video::s_stream - * operation otherwise. + * operation otherwise. The pipeline state is not updated when the operation + * fails, except when stopping the pipeline. */ int omap3isp_pipeline_set_stream(struct isp_pipeline *pipe, enum isp_pipeline_stream_state state) @@ -895,7 +899,9 @@ int omap3isp_pipeline_set_stream(struct isp_pipeline *pipe, ret = isp_pipeline_disable(pipe); else ret = isp_pipeline_enable(pipe, state); - pipe->stream_state = state; + + if (ret == 0 || state == ISP_PIPELINE_STREAM_STOPPED) + pipe->stream_state = state; return ret; } @@ -1481,6 +1487,10 @@ void omap3isp_put(struct isp_device *isp) if (--isp->ref_count == 0) { isp_disable_interrupts(isp); isp_save_ctx(isp); + if (isp->needs_reset) { + isp_reset(isp); + isp->needs_reset = false; + } isp_disable_clocks(isp); } mutex_unlock(&isp->isp_mutex); diff --git a/drivers/media/video/omap3isp/isp.h b/drivers/media/video/omap3isp/isp.h index cf5214e95a92..5f87645565b8 100644 --- a/drivers/media/video/omap3isp/isp.h +++ b/drivers/media/video/omap3isp/isp.h @@ -262,6 +262,7 @@ struct isp_device { /* ISP Obj */ spinlock_t stat_lock; /* common lock for statistic drivers */ struct mutex isp_mutex; /* For handling ref_count field */ + bool needs_reset; int has_context; int ref_count; unsigned int autoidle; -- 2.20.1