diff options
Diffstat (limited to 'drivers/media/video/marvell-ccic/mcam-core.c')
| -rw-r--r-- | drivers/media/video/marvell-ccic/mcam-core.c | 42 |
1 files changed, 32 insertions, 10 deletions
diff --git a/drivers/media/video/marvell-ccic/mcam-core.c b/drivers/media/video/marvell-ccic/mcam-core.c index 80ec64d2d6d..37d20e73908 100644 --- a/drivers/media/video/marvell-ccic/mcam-core.c +++ b/drivers/media/video/marvell-ccic/mcam-core.c @@ -51,7 +51,7 @@ static int delivered; * sense. */ -static int alloc_bufs_at_read; +static bool alloc_bufs_at_read; module_param(alloc_bufs_at_read, bool, 0444); MODULE_PARM_DESC(alloc_bufs_at_read, "Non-zero value causes DMA buffers to be allocated when the " @@ -73,11 +73,11 @@ MODULE_PARM_DESC(dma_buf_size, "parameters require larger buffers, an attempt to reallocate " "will be made."); #else /* MCAM_MODE_VMALLOC */ -static const int alloc_bufs_at_read = 0; +static const bool alloc_bufs_at_read = 0; static const int n_dma_bufs = 3; /* Used by S/G_PARM */ #endif /* MCAM_MODE_VMALLOC */ -static int flip; +static bool flip; module_param(flip, bool, 0444); MODULE_PARM_DESC(flip, "If set, the sensor will be instructed to flip the image " @@ -522,6 +522,15 @@ static void mcam_sg_next_buffer(struct mcam_camera *cam) */ static void mcam_ctlr_dma_sg(struct mcam_camera *cam) { + /* + * The list-empty condition can hit us at resume time + * if the buffer list was empty when the system was suspended. + */ + if (list_empty(&cam->buffers)) { + set_bit(CF_SG_RESTART, &cam->flags); + return; + } + mcam_reg_clear_bit(cam, REG_CTRL1, C1_DESC_3WORD); mcam_sg_next_buffer(cam); mcam_reg_set_bit(cam, REG_CTRL1, C1_DESC_ENA); @@ -566,6 +575,7 @@ static void mcam_dma_sg_done(struct mcam_camera *cam, int frame) } else { set_bit(CF_SG_RESTART, &cam->flags); singles++; + cam->vb_bufs[0] = NULL; } /* * Now we can give the completed frame back to user space. @@ -661,10 +671,10 @@ static int mcam_ctlr_configure(struct mcam_camera *cam) unsigned long flags; spin_lock_irqsave(&cam->dev_lock, flags); + clear_bit(CF_SG_RESTART, &cam->flags); cam->dma_setup(cam); mcam_ctlr_image(cam); mcam_set_config_needed(cam, 0); - clear_bit(CF_SG_RESTART, &cam->flags); spin_unlock_irqrestore(&cam->dev_lock, flags); return 0; } @@ -873,7 +883,8 @@ static int mcam_read_setup(struct mcam_camera *cam) mcam_reset_buffers(cam); mcam_ctlr_irq_enable(cam); cam->state = S_STREAMING; - mcam_ctlr_start(cam); + if (!test_bit(CF_SG_RESTART, &cam->flags)) + mcam_ctlr_start(cam); spin_unlock_irqrestore(&cam->dev_lock, flags); return 0; } @@ -1818,11 +1829,15 @@ void mccic_shutdown(struct mcam_camera *cam) void mccic_suspend(struct mcam_camera *cam) { - enum mcam_state cstate = cam->state; + mutex_lock(&cam->s_mutex); + if (cam->users > 0) { + enum mcam_state cstate = cam->state; - mcam_ctlr_stop_dma(cam); - mcam_ctlr_power_down(cam); - cam->state = cstate; + mcam_ctlr_stop_dma(cam); + mcam_ctlr_power_down(cam); + cam->state = cstate; + } + mutex_unlock(&cam->s_mutex); } int mccic_resume(struct mcam_camera *cam) @@ -1839,8 +1854,15 @@ int mccic_resume(struct mcam_camera *cam) mutex_unlock(&cam->s_mutex); set_bit(CF_CONFIG_NEEDED, &cam->flags); - if (cam->state == S_STREAMING) + if (cam->state == S_STREAMING) { + /* + * If there was a buffer in the DMA engine at suspend + * time, put it back on the queue or we'll forget about it. + */ + if (cam->buffer_mode == B_DMA_sg && cam->vb_bufs[0]) + list_add(&cam->vb_bufs[0]->queue, &cam->buffers); ret = mcam_read_setup(cam); + } return ret; } #endif /* CONFIG_PM */ |