Hi,
On Fri, Mar 09, 2018 at 11:14:41AM +0100, Paul Kocialkowski wrote:
> +/*
> + * mem2mem callbacks
> + */
> +
> +void job_abort(void *priv)
> +{}
Is that still needed?
> +/*
> + * device_run() - prepares and starts processing
> + */
> +void device_run(void *priv)
> +{
This function (and the one above) should probably made static. Or at
least if you can't, they should have a much more specific name in
order not to conflict with anything from the core.
> + /*
> + * The VPU is only able to handle bus addresses so we have to subtract
> + * the RAM offset to the physcal addresses
> + */
> + in_buf -= PHYS_OFFSET;
> + out_luma -= PHYS_OFFSET;
> + out_chroma -= PHYS_OFFSET;
You should take care of that by putting it in the dma_pfn_offset field
of the struct device (at least before we come up with something
better).
You'll then be able to use the dma_addr_t directly without modifying it.
> + vpu->syscon = syscon_regmap_lookup_by_phandle(vpu->dev->of_node,
> + "syscon");
> + if (IS_ERR(vpu->syscon)) {
> + vpu->syscon = NULL;
> + } else {
> + regmap_write_bits(vpu->syscon, SYSCON_SRAM_CTRL_REG0,
> + SYSCON_SRAM_C1_MAP_VE,
> + SYSCON_SRAM_C1_MAP_VE);
> + }
This should be using our SRAM controller driver (and API), see
Documentation/devicetree/bindings/sram/sunxi-sram.txt
include/linux/soc/sunxi/sunxi_sram.h
> + ret = clk_prepare_enable(vpu->ahb_clk);
> + if (ret) {
> + dev_err(vpu->dev, "could not enable ahb clock\n");
> + return -EFAULT;
> + }
> + ret = clk_prepare_enable(vpu->mod_clk);
> + if (ret) {
> + clk_disable_unprepare(vpu->ahb_clk);
> + dev_err(vpu->dev, "could not enable mod clock\n");
> + return -EFAULT;
> + }
> + ret = clk_prepare_enable(vpu->ram_clk);
> + if (ret) {
> + clk_disable_unprepare(vpu->mod_clk);
> + clk_disable_unprepare(vpu->ahb_clk);
> + dev_err(vpu->dev, "could not enable ram clock\n");
> + return -EFAULT;
> + }
Ideally, this should be using runtime_pm to manage the device power
state, and disable it when not used.
> + reset_control_assert(vpu->rstc);
> + reset_control_deassert(vpu->rstc);
You can use reset_control_reset here
> + return 0;
> +}
> +
> +void sunxi_cedrus_hw_remove(struct sunxi_cedrus_dev *vpu)
> +{
> + clk_disable_unprepare(vpu->ram_clk);
> + clk_disable_unprepare(vpu->mod_clk);
> + clk_disable_unprepare(vpu->ahb_clk);
The device is not put back into reset here
Thanks!
Maxime
--
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com
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