On Tue, Sep 07, 2021 at 09:29:15AM +0200, Daniel Brát wrote:
> The bcm2835 framebuffer driver was broken, because the address of video
> buffer allocated for us by the GPU and returned through mailbox was
> used without converting it back to ARM address space. That unconverted
> address was also in the range of peripheral addresses, which caused
> other issues later on due to it being filled with garbage data.
> The offset by which to convert the address back can vary by device,
> so the value is read from devicetree 'dma-ranges' for somewhat portable
> operation.
> This fix was tested on Raspberry PI B+ and Raspberry PI 3B+.
>
> Signed-off-by: Daniel Brát <danek.brat@xxxxxxxxx>
> ---
> drivers/video/bcm2835.c | 21 +++++++++++++++++++--
> 1 file changed, 19 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/video/bcm2835.c b/drivers/video/bcm2835.c
> index d808bc5c9..2ebe912d0 100644
> --- a/drivers/video/bcm2835.c
> +++ b/drivers/video/bcm2835.c
> @@ -14,6 +14,7 @@
> #include <malloc.h>
> #include <xfuncs.h>
>
> +#include <of_address.h>
> #include <mach/mbox.h>
>
> struct bcm2835fb_info {
> @@ -58,9 +59,24 @@ static int bcm2835fb_probe(struct device_d *dev)
> BCM2835_MBOX_STACK_ALIGN(struct msg_fb_query, msg_query);
> BCM2835_MBOX_STACK_ALIGN(struct msg_fb_setup, msg_setup);
> struct bcm2835fb_info *info;
> + struct device_node *soc;
> u32 w, h;
> + u64 dma_addr, cpu_addr, _region_size;
> + phys_addr_t buffer_addr;
> int ret;
>
> + soc = of_find_node_by_path("/soc");
> + if (!soc) {
> + dev_err(dev, "could not find required of node /soc\n");
Nit: I'd use "OF" in capitals to ease human parsing and prevent
confusing with the English preposition.
> + return -ENODEV;
> + }
> +
> + ret = of_dma_get_range(soc, &dma_addr, &cpu_addr, &_region_size);
> + if (ret) {
> + dev_err(dev, "of node /soc has no dma-ranges\n");
Here too.
- Roland
> + return ret;
> + }
> +
> BCM2835_MBOX_INIT_HDR(msg_query);
> BCM2835_MBOX_INIT_TAG_NO_REQ(&msg_query->physical_w_h,
> GET_PHYSICAL_W_H);
> @@ -99,10 +115,11 @@ static int bcm2835fb_probe(struct device_d *dev)
> return ret;
> }
>
> + buffer_addr = (msg_setup->allocate_buffer.body.resp.fb_address & ~dma_addr) + cpu_addr;
> +
> info = xzalloc(sizeof *info);
> info->fbi.fbops = &bcm2835fb_ops;
> - info->fbi.screen_base =
> - (void *)msg_setup->allocate_buffer.body.resp.fb_address;
> + info->fbi.screen_base = phys_to_virt(buffer_addr);
> info->fbi.xres = msg_setup->physical_w_h.body.resp.width;
> info->fbi.yres = msg_setup->physical_w_h.body.resp.height;
> info->fbi.bits_per_pixel = 16;
> --
> 2.17.1
>
>
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--
Roland Hieber, Pengutronix e.K. | r.hieber@xxxxxxxxxxxxxx |
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31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
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