On Wed, Jun 01, 2016 at 05:19:12PM +0800, Yakir Yang wrote:
> There is a bug in RK3399 VOP, when bootloader/kernel only enable
> VOP Big or VOP Little to display, then VOP IOMMU would failed to
> reset at the initial time and VOP register couldn't write rightly.
>
> After do the pure reset of VOP module, then things back to right.
>
> Signed-off-by: Yakir Yang <ykk@xxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 15 ++++++++++++++-
> 1 file changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index 1c4d5b5..4150323 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -1292,7 +1292,7 @@ static int vop_initial(struct vop *vop)
> {
> const struct vop_data *vop_data = vop->data;
> const struct vop_reg_data *init_table = vop_data->init_table;
> - struct reset_control *ahb_rst;
> + struct reset_control *ahb_rst, *axi_rst;
> int i, ret;
>
> vop->hclk = devm_clk_get(vop->dev, "hclk_vop");
> @@ -1331,6 +1331,19 @@ static int vop_initial(struct vop *vop)
> }
>
> /*
> + * do aclk_reset, reset all vop registers.
> + */
> + axi_rst = devm_reset_control_get(vop->dev, "axi");
I don't think you want the managed version here since you only store
this in a local variable and hence aren't going to need it afterwards.
Just use reset_control_get() and ...
> + if (IS_ERR(axi_rst)) {
> + dev_err(vop->dev, "failed to get axi reset\n");
> + ret = PTR_ERR(axi_rst);
> + goto err_disable_aclk;
> + }
> + reset_control_assert(axi_rst);
> + usleep_range(10, 20);
> + reset_control_deassert(axi_rst);
call reset_control_put() here.
> +
> + /*
> * do hclk_reset, reset all vop registers.
> */
> ahb_rst = devm_reset_control_get(vop->dev, "ahb");
This uses the same pattern, so you might want to consider reworking this
as well, though it should be a separate patch.
Thierry
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