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| author | Linus Walleij <linus.walleij@linaro.org> | 2018-03-07 22:58:19 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-03-07 23:14:24 +0100 |
| commit | df99dd9202216f54eaf672e07808e9198d868af6 (patch) | |
| tree | ee75d257bc640dec1ff405deca483e83b63216e2 /drivers/gpu/drm/pl111/pl111_drm.h | |
| parent | 2e7a66a8b5ebf1b04a866e5d7c981640f7f62934 (diff) | |
| download | linux-df99dd9202216f54eaf672e07808e9198d868af6.tar.gz linux-df99dd9202216f54eaf672e07808e9198d868af6.tar.bz2 linux-df99dd9202216f54eaf672e07808e9198d868af6.zip | |
drm/pl111: Use max memory bandwidth for resolution
We were previously selecting 1024x768 and 32BPP as the default
set-up for the PL111 consumers.
This does not work on elder systems: the device tree bindings
support a property "max-memory-bandwidth" in bytes/second that
states that if you exceed this the memory bus will saturate.
The result is flickering and unstable images.
Parse the "max-memory-bandwidth" and respect it when
intializing the driver. On the RealView PB11MP, Versatile and
Integrator/CP we get a nice console as default with this code.
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180307215819.15814-1-linus.walleij@linaro.org
Diffstat (limited to 'drivers/gpu/drm/pl111/pl111_drm.h')
| -rw-r--r-- | drivers/gpu/drm/pl111/pl111_drm.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/pl111/pl111_drm.h b/drivers/gpu/drm/pl111/pl111_drm.h index 2a93e0134061..8639b2d4ddf7 100644 --- a/drivers/gpu/drm/pl111/pl111_drm.h +++ b/drivers/gpu/drm/pl111/pl111_drm.h @@ -65,6 +65,7 @@ struct pl111_drm_dev_private { struct drm_simple_display_pipe pipe; void *regs; + u32 memory_bw; u32 ienb; u32 ctrl; /* The pixel clock (a reference to our clock divider off of CLCDCLK). */ |