media: ti-vpe: cal: add cal_ctx_wr_dma_enable and fix a race

commit c3a12a7441b773fadff8162f607220aa26b55ed3 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



I have not noticed any errors due to this, but the DMA configuration
looks racy. Setting the DMA mode bitfield in CAL_WR_DMA_CTRL supposedly
enables the DMA. However, the driver currently a) continues configuring
the DMA after setting the mode, and b) enables the DMA interrupts only
after setting the mode.

This probably doesn't cause any issues as there should be no data coming
in to the DMA yet, but it's still better to fix this.

Add a new function, cal_ctx_wr_dma_enable(), to set the DMA mode field,
and call that function only after the DMA config and the irq enabling
has been done.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>