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@rock-chips.com --- 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"); + 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); + + /* * do hclk_reset, reset all vop registers. */ ahb_rst = devm_reset_control_get(vop->dev, "ahb");
On 2016年06月01日 17:19, 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@rock-chips.com
Hi Yakir
I think you get vop iommu reset failed should be IOMMU Page fault, the vop iommu access a ummap address.
You should ensure all vop windows access right iommu mapping address before attach iommu.
Actually, I'm working no flash display from bootloader to kernel, and prepare remove all the reset on vop initial, because it would flash the display.
Thanks.
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");
- 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);
- /*
*/ ahb_rst = devm_reset_control_get(vop->dev, "ahb");
- do hclk_reset, reset all vop registers.
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@rock-chips.com
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.
- /*
*/ ahb_rst = devm_reset_control_get(vop->dev, "ahb");
- do hclk_reset, reset all vop registers.
This uses the same pattern, so you might want to consider reworking this as well, though it should be a separate patch.
Thierry
On 06/01/2016 11:19 PM, Thierry Reding wrote:
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@rock-chips.com
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 ...
Great, but seems Mark would not accept this fix now :( Maybe I should found the root cause why my bootloader/kernel would broken the VOP.
Thanks, - Yakir
- 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.
- /*
*/ ahb_rst = devm_reset_control_get(vop->dev, "ahb");
- do hclk_reset, reset all vop registers.
This uses the same pattern, so you might want to consider reworking this as well, though it should be a separate patch.
Thierry
dri-devel@lists.freedesktop.org
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Mark yao -
Thierry Reding -
Yakir Yang