[PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2

[PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2

[Harry Wentland]

For some reason this file isn't using the appropriate register
headers for DCN headers, which means that on DCN2 we're getting
the VIEWPORT_DIMENSION offset wrong.

This means that we're not correctly carving out the framebuffer
memory correctly for a framebuffer allocated by EFI and
therefore see corruption when loading amdgpu before the display
driver takes over control of the framebuffer scanout.

Fix this by checking the DCE_HWIP and picking the correct offset
accordingly.

Long-term we should expose this info from DC as GMC shouldn't
need to know about DCN registers.

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 57f2729a7bd0..8367ecf61af1 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -72,6 +72,9 @@
 #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0                                                                  0x049d
 #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0_BASE_IDX                                                         2
 
+#define DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION                                                          0x05ea
+#define DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION_BASE_IDX                                                 2
+
 
 static const char *gfxhub_client_ids[] = {
 	"CB",
@@ -1142,7 +1145,6 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
 		switch (adev->ip_versions[DCE_HWIP][0]) {
 		case IP_VERSION(1, 0, 0):
 		case IP_VERSION(1, 0, 1):
-		case IP_VERSION(2, 1, 0):
 			viewport = RREG32_SOC15(DCE, 0, mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
 			size = (REG_GET_FIELD(viewport,
 					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
@@ -1150,6 +1152,14 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
 					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
 				4);
 			break;
+		case IP_VERSION(2, 1, 0):
+			viewport = RREG32_SOC15(DCE, 0, DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
+			size = (REG_GET_FIELD(viewport,
+					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
+				REG_GET_FIELD(viewport,
+					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
+				4);
+			break;
 		default:
 			viewport = RREG32_SOC15(DCE, 0, mmSCL0_VIEWPORT_SIZE);
 			size = (REG_GET_FIELD(viewport, SCL0_VIEWPORT_SIZE, VIEWPORT_HEIGHT) *
-- 
2.34.1

Re: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2

[Huang Rui]

On Thu, Jan 06, 2022 at 04:39:01AM +0800, Harry Wentland wrote:
> For some reason this file isn't using the appropriate register
> headers for DCN headers, which means that on DCN2 we're getting
> the VIEWPORT_DIMENSION offset wrong.
> 
> This means that we're not correctly carving out the framebuffer
> memory correctly for a framebuffer allocated by EFI and
> therefore see corruption when loading amdgpu before the display
> driver takes over control of the framebuffer scanout.
> 
> Fix this by checking the DCE_HWIP and picking the correct offset
> accordingly.
> 
> Long-term we should expose this info from DC as GMC shouldn't
> need to know about DCN registers.
> 
> Signed-off-by: Harry Wentland <harry.wentland@amd.com>

Look good for me, this patch needs to backport it to stable kernel (CC
stable mailing list).

Reviewed-by: Huang Rui <ray.huang@amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> index 57f2729a7bd0..8367ecf61af1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> @@ -72,6 +72,9 @@
>  #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0                                                                  0x049d
>  #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0_BASE_IDX                                                         2
>  
> +#define DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION                                                          0x05ea
> +#define DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION_BASE_IDX                                                 2
> +
>  
>  static const char *gfxhub_client_ids[] = {
>  	"CB",
> @@ -1142,7 +1145,6 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
>  		switch (adev->ip_versions[DCE_HWIP][0]) {
>  		case IP_VERSION(1, 0, 0):
>  		case IP_VERSION(1, 0, 1):
> -		case IP_VERSION(2, 1, 0):
>  			viewport = RREG32_SOC15(DCE, 0, mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
>  			size = (REG_GET_FIELD(viewport,
>  					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
> @@ -1150,6 +1152,14 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
>  					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
>  				4);
>  			break;
> +		case IP_VERSION(2, 1, 0):
> +			viewport = RREG32_SOC15(DCE, 0, DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
> +			size = (REG_GET_FIELD(viewport,
> +					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
> +				REG_GET_FIELD(viewport,
> +					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
> +				4);
> +			break;
>  		default:
>  			viewport = RREG32_SOC15(DCE, 0, mmSCL0_VIEWPORT_SIZE);
>  			size = (REG_GET_FIELD(viewport, SCL0_VIEWPORT_SIZE, VIEWPORT_HEIGHT) *
> -- 
> 2.34.1
> 

Re: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2

[Christian König]

Am 05.01.22 um 21:39 schrieb Harry Wentland:
> For some reason this file isn't using the appropriate register
> headers for DCN headers, which means that on DCN2 we're getting
> the VIEWPORT_DIMENSION offset wrong.
>
> This means that we're not correctly carving out the framebuffer
> memory correctly for a framebuffer allocated by EFI and
> therefore see corruption when loading amdgpu before the display
> driver takes over control of the framebuffer scanout.
>
> Fix this by checking the DCE_HWIP and picking the correct offset
> accordingly.
>
> Long-term we should expose this info from DC as GMC shouldn't
> need to know about DCN registers.
>
> Signed-off-by: Harry Wentland <harry.wentland@amd.com>

Please add a TODO comment that in the long run that code should be moved 
into DC.

With that done the patch is Acked-by: Christian König 
<christian.koenig@amd.com>.

Thanks,
Christian.

> ---
>   drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 12 +++++++++++-
>   1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> index 57f2729a7bd0..8367ecf61af1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> @@ -72,6 +72,9 @@
>   #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0                                                                  0x049d
>   #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0_BASE_IDX                                                         2
>   
> +#define DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION                                                          0x05ea
> +#define DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION_BASE_IDX                                                 2
> +
>   
>   static const char *gfxhub_client_ids[] = {
>   	"CB",
> @@ -1142,7 +1145,6 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
>   		switch (adev->ip_versions[DCE_HWIP][0]) {
>   		case IP_VERSION(1, 0, 0):
>   		case IP_VERSION(1, 0, 1):
> -		case IP_VERSION(2, 1, 0):
>   			viewport = RREG32_SOC15(DCE, 0, mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
>   			size = (REG_GET_FIELD(viewport,
>   					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
> @@ -1150,6 +1152,14 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
>   					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
>   				4);
>   			break;
> +		case IP_VERSION(2, 1, 0):
> +			viewport = RREG32_SOC15(DCE, 0, DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
> +			size = (REG_GET_FIELD(viewport,
> +					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
> +				REG_GET_FIELD(viewport,
> +					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
> +				4);
> +			break;
>   		default:
>   			viewport = RREG32_SOC15(DCE, 0, mmSCL0_VIEWPORT_SIZE);
>   			size = (REG_GET_FIELD(viewport, SCL0_VIEWPORT_SIZE, VIEWPORT_HEIGHT) *

RE: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2

[Deucher, Alexander]

[Public]

> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces@lists.freedesktop.org> On Behalf Of
> Harry Wentland
> Sent: Wednesday, January 5, 2022 3:39 PM
> To: amd-gfx@lists.freedesktop.org; Koenig, Christian
> <Christian.Koenig@amd.com>; Lee, Becle <Becle.Lee@amd.com>; Huang,
> Rex <Rex.Huang@amd.com>; Huang, Ray <Ray.Huang@amd.com>
> Cc: Wentland, Harry <Harry.Wentland@amd.com>
> Subject: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for
> DCN2
> 
> For some reason this file isn't using the appropriate register headers for DCN
> headers, which means that on DCN2 we're getting the
> VIEWPORT_DIMENSION offset wrong.
> 
> This means that we're not correctly carving out the framebuffer memory
> correctly for a framebuffer allocated by EFI and therefore see corruption
> when loading amdgpu before the display driver takes over control of the
> framebuffer scanout.
> 
> Fix this by checking the DCE_HWIP and picking the correct offset accordingly.
> 
> Long-term we should expose this info from DC as GMC shouldn't need to
> know about DCN registers.
> 
> Signed-off-by: Harry Wentland <harry.wentland@amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> index 57f2729a7bd0..8367ecf61af1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> @@ -72,6 +72,9 @@
>  #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0
> 0x049d
>  #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0_BASE_IDX
> 2
> 
> +#define DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION
> 0x05ea
> +#define
> DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION_BASE_IDX
> 2
> +

We normally append the _DCN2 to the end in these cases of the macro.  With that fixed,
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

> 
>  static const char *gfxhub_client_ids[] = {
>  	"CB",
> @@ -1142,7 +1145,6 @@ static unsigned
> gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
>  		switch (adev->ip_versions[DCE_HWIP][0]) {
>  		case IP_VERSION(1, 0, 0):
>  		case IP_VERSION(1, 0, 1):
> -		case IP_VERSION(2, 1, 0):
>  			viewport = RREG32_SOC15(DCE, 0,
> mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
>  			size = (REG_GET_FIELD(viewport,
> 
> HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
> @@ -1150,6 +1152,14 @@ static unsigned
> gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
> 
> HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
>  				4);
>  			break;
> +		case IP_VERSION(2, 1, 0):
> +			viewport = RREG32_SOC15(DCE, 0,
> DCN2_mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
> +			size = (REG_GET_FIELD(viewport,
> +
> HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
> +				REG_GET_FIELD(viewport,
> +
> HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
> +				4);
> +			break;
>  		default:
>  			viewport = RREG32_SOC15(DCE, 0,
> mmSCL0_VIEWPORT_SIZE);
>  			size = (REG_GET_FIELD(viewport,
> SCL0_VIEWPORT_SIZE, VIEWPORT_HEIGHT) *
> --
> 2.34.1

Re: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2

[Greg KH]

On Tue, Jan 25, 2022 at 03:52:47PM +0000, Limonciello, Mario wrote:
> [Public]
> 
> > -----Original Message-----
> > From: Greg KH <gregkh@linuxfoundation.org>
> > Sent: Tuesday, January 25, 2022 09:50
> > To: Limonciello, Mario <Mario.Limonciello@amd.com>
> > Cc: stable@vger.kernel.org; Deucher, Alexander
> > <Alexander.Deucher@amd.com>; Wentland, Harry
> > <Harry.Wentland@amd.com>
> > Subject: Re: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for
> > DCN2
> > 
> > On Tue, Jan 25, 2022 at 09:21:11AM -0600, Mario Limonciello wrote:
> > > For some reason this file isn't using the appropriate register
> > > headers for DCN headers, which means that on DCN2 we're getting
> > > the VIEWPORT_DIMENSION offset wrong.
> > >
> > > This means that we're not correctly carving out the framebuffer
> > > memory correctly for a framebuffer allocated by EFI and
> > > therefore see corruption when loading amdgpu before the display
> > > driver takes over control of the framebuffer scanout.
> > >
> > > Fix this by checking the DCE_HWIP and picking the correct offset
> > > accordingly.
> > >
> > > Long-term we should expose this info from DC as GMC shouldn't
> > > need to know about DCN registers.
> > >
> > > Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> > > (cherry picked from commit dc5d4aff2e99c312df8abbe1ee9a731d2913bc1b)
> > > ---
> > > This is backported from 5.17-rc1, but doesn't backport cleanly because
> > > v5.16 changed to IP version harvesting for ASIC detection.  5.15.y doesn't
> > > have this.
> > >  drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 14 +++++++++++++-
> > >  1 file changed, 13 insertions(+), 1 deletion(-)
> > 
> > What stable tree(s) do you want this applied to?
> > 
> 
> The original commit it was cherry-picked from was CC to @stable and it
> should have applied to 5.16 from that. 
> 
> This fixed commit should go into 5.15.y.

Thanks, now queued up.

> > And what happened to the original signed-off-by's on the original
> > commit?
> 
> I dropped them because I had to change code to do the backport, it didn't seem reasonable
> to me to keep all of their ACK's/signed-off-by's on the code still.
> 
> If that's incorrect, please let me know and I can re-send with the exact same commit message.

Please keep them.  I've fixed this up for now, so no need for a resend.

thanks,

greg k-h

RE: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2

[Limonciello, Mario]

[Public]

> -----Original Message-----
> From: Greg KH <gregkh@linuxfoundation.org>
> Sent: Tuesday, January 25, 2022 09:50
> To: Limonciello, Mario <Mario.Limonciello@amd.com>
> Cc: stable@vger.kernel.org; Deucher, Alexander
> <Alexander.Deucher@amd.com>; Wentland, Harry
> <Harry.Wentland@amd.com>
> Subject: Re: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for
> DCN2
> 
> On Tue, Jan 25, 2022 at 09:21:11AM -0600, Mario Limonciello wrote:
> > For some reason this file isn't using the appropriate register
> > headers for DCN headers, which means that on DCN2 we're getting
> > the VIEWPORT_DIMENSION offset wrong.
> >
> > This means that we're not correctly carving out the framebuffer
> > memory correctly for a framebuffer allocated by EFI and
> > therefore see corruption when loading amdgpu before the display
> > driver takes over control of the framebuffer scanout.
> >
> > Fix this by checking the DCE_HWIP and picking the correct offset
> > accordingly.
> >
> > Long-term we should expose this info from DC as GMC shouldn't
> > need to know about DCN registers.
> >
> > Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> > (cherry picked from commit dc5d4aff2e99c312df8abbe1ee9a731d2913bc1b)
> > ---
> > This is backported from 5.17-rc1, but doesn't backport cleanly because
> > v5.16 changed to IP version harvesting for ASIC detection.  5.15.y doesn't
> > have this.
> >  drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 14 +++++++++++++-
> >  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> What stable tree(s) do you want this applied to?
> 

The original commit it was cherry-picked from was CC to @stable and it
should have applied to 5.16 from that. 

This fixed commit should go into 5.15.y.

> And what happened to the original signed-off-by's on the original
> commit?

I dropped them because I had to change code to do the backport, it didn't seem reasonable
to me to keep all of their ACK's/signed-off-by's on the code still.

If that's incorrect, please let me know and I can re-send with the exact same commit message.

> 
> thanks,
> 
> greg k-h

Re: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2

[Greg KH]

On Tue, Jan 25, 2022 at 09:21:11AM -0600, Mario Limonciello wrote:
> For some reason this file isn't using the appropriate register
> headers for DCN headers, which means that on DCN2 we're getting
> the VIEWPORT_DIMENSION offset wrong.
> 
> This means that we're not correctly carving out the framebuffer
> memory correctly for a framebuffer allocated by EFI and
> therefore see corruption when loading amdgpu before the display
> driver takes over control of the framebuffer scanout.
> 
> Fix this by checking the DCE_HWIP and picking the correct offset
> accordingly.
> 
> Long-term we should expose this info from DC as GMC shouldn't
> need to know about DCN registers.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> (cherry picked from commit dc5d4aff2e99c312df8abbe1ee9a731d2913bc1b)
> ---
> This is backported from 5.17-rc1, but doesn't backport cleanly because
> v5.16 changed to IP version harvesting for ASIC detection.  5.15.y doesn't
> have this.
>  drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)

What stable tree(s) do you want this applied to?

And what happened to the original signed-off-by's on the original
commit?

thanks,

greg k-h

RE: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2

[Limonciello, Mario]

[Public]


> -----Original Message-----
> From: Limonciello, Mario <Mario.Limonciello@amd.com>
> Sent: Tuesday, January 25, 2022 09:21
> To: stable@vger.kernel.org
> Cc: Deucher, Alexander <Alexander.Deucher@amd.com>; Wentland, Harry
> <Harry.Wentland@amd.com>; Limonciello, Mario
> <Mario.Limonciello@amd.com>
> Subject: [PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2
> 
> For some reason this file isn't using the appropriate register
> headers for DCN headers, which means that on DCN2 we're getting
> the VIEWPORT_DIMENSION offset wrong.
> 
> This means that we're not correctly carving out the framebuffer
> memory correctly for a framebuffer allocated by EFI and
> therefore see corruption when loading amdgpu before the display
> driver takes over control of the framebuffer scanout.
> 
> Fix this by checking the DCE_HWIP and picking the correct offset
> accordingly.
> 
> Long-term we should expose this info from DC as GMC shouldn't
> need to know about DCN registers.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
> (cherry picked from commit dc5d4aff2e99c312df8abbe1ee9a731d2913bc1b)
> ---
> This is backported from 5.17-rc1, but doesn't backport cleanly because
> v5.16 changed to IP version harvesting for ASIC detection.  5.15.y doesn't
> have this.
>  drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)

One more comment - dc5d4aff2e99c3 backports cleanly to 5.16.y.
So it should just be a straightforward cherry-pick in 5.16.y, this special
modification only for 5.15.y.

> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> index 5551359d5dfd..a4adbbf3acab 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> @@ -72,6 +72,9 @@
>  #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0
> 0x049d
>  #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0_BASE_IDX
> 2
> 
> +#define mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION_DCN2
> 0x05ea
> +#define mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION_DCN2_BASE_IDX
> 2
> +
> 
>  static const char *gfxhub_client_ids[] = {
>  	"CB",
> @@ -1103,6 +1106,8 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct
> amdgpu_device *adev)
>  	u32 d1vga_control = RREG32_SOC15(DCE, 0, mmD1VGA_CONTROL);
>  	unsigned size;
> 
> +	/* TODO move to DC so GMC doesn't need to hard-code DCN registers
> */
> +
>  	if (REG_GET_FIELD(d1vga_control, D1VGA_CONTROL,
> D1VGA_MODE_ENABLE)) {
>  		size = AMDGPU_VBIOS_VGA_ALLOCATION;
>  	} else {
> @@ -1110,7 +1115,6 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct
> amdgpu_device *adev)
> 
>  		switch (adev->asic_type) {
>  		case CHIP_RAVEN:
> -		case CHIP_RENOIR:
>  			viewport = RREG32_SOC15(DCE, 0,
> mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
>  			size = (REG_GET_FIELD(viewport,
> 
> HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
> @@ -1118,6 +1122,14 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct
> amdgpu_device *adev)
> 
> HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
>  				4);
>  			break;
> +		case CHIP_RENOIR:
> +			viewport = RREG32_SOC15(DCE, 0,
> mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION_DCN2);
> +			size = (REG_GET_FIELD(viewport,
> +
> HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
> +				REG_GET_FIELD(viewport,
> +
> HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
> +				4);
> +			break;
>  		case CHIP_VEGA10:
>  		case CHIP_VEGA12:
>  		case CHIP_VEGA20:
> --
> 2.25.1

[PATCH] drm/amdgpu: Use correct VIEWPORT_DIMENSION for DCN2

[Mario Limonciello]

For some reason this file isn't using the appropriate register
headers for DCN headers, which means that on DCN2 we're getting
the VIEWPORT_DIMENSION offset wrong.

This means that we're not correctly carving out the framebuffer
memory correctly for a framebuffer allocated by EFI and
therefore see corruption when loading amdgpu before the display
driver takes over control of the framebuffer scanout.

Fix this by checking the DCE_HWIP and picking the correct offset
accordingly.

Long-term we should expose this info from DC as GMC shouldn't
need to know about DCN registers.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
(cherry picked from commit dc5d4aff2e99c312df8abbe1ee9a731d2913bc1b)
---
This is backported from 5.17-rc1, but doesn't backport cleanly because
v5.16 changed to IP version harvesting for ASIC detection.  5.15.y doesn't
have this.
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 5551359d5dfd..a4adbbf3acab 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -72,6 +72,9 @@
 #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0                                                                  0x049d
 #define mmDCHUBBUB_SDPIF_MMIO_CNTRL_0_BASE_IDX                                                         2
 
+#define mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION_DCN2                                                          0x05ea
+#define mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION_DCN2_BASE_IDX                                                 2
+
 
 static const char *gfxhub_client_ids[] = {
 	"CB",
@@ -1103,6 +1106,8 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
 	u32 d1vga_control = RREG32_SOC15(DCE, 0, mmD1VGA_CONTROL);
 	unsigned size;
 
+	/* TODO move to DC so GMC doesn't need to hard-code DCN registers */
+
 	if (REG_GET_FIELD(d1vga_control, D1VGA_CONTROL, D1VGA_MODE_ENABLE)) {
 		size = AMDGPU_VBIOS_VGA_ALLOCATION;
 	} else {
@@ -1110,7 +1115,6 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
 
 		switch (adev->asic_type) {
 		case CHIP_RAVEN:
-		case CHIP_RENOIR:
 			viewport = RREG32_SOC15(DCE, 0, mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION);
 			size = (REG_GET_FIELD(viewport,
 					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
@@ -1118,6 +1122,14 @@ static unsigned gmc_v9_0_get_vbios_fb_size(struct amdgpu_device *adev)
 					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
 				4);
 			break;
+		case CHIP_RENOIR:
+			viewport = RREG32_SOC15(DCE, 0, mmHUBP0_DCSURF_PRI_VIEWPORT_DIMENSION_DCN2);
+			size = (REG_GET_FIELD(viewport,
+					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_HEIGHT) *
+				REG_GET_FIELD(viewport,
+					      HUBP0_DCSURF_PRI_VIEWPORT_DIMENSION, PRI_VIEWPORT_WIDTH) *
+				4);
+			break;
 		case CHIP_VEGA10:
 		case CHIP_VEGA12:
 		case CHIP_VEGA20:
-- 
2.25.1