[PATCH v4 2/8] arm: mach-k3: common: Reserve video memory from end of the RAM

[Nikhil Jain]

Hi Devarsh,

On 25/11/23 21:56, Devarsh Thakkar wrote:
> Setup video memory before page table reservation using
> "spl_reserve_video_from_ram_top" which ensures framebuffer memory gets
> reserved from the end of RAM.
>
> This is done to enable the next stage to directly skip the
> pre-reserved area from previous stage right from the end of RAM without
> having to make any gaps/holes to accommodate those regions which was the
> case before as previous stage reserved region not from the end of RAM.
>
> Use gd->ram_top instead of local ram_top and update gd->reloc_addr after
> each reservation to ensure further regions are reserved properly.
>
> Signed-off-by: Devarsh Thakkar <devarsht at ti.com>

Reviewed-by: Nikhil M Jain <n-jain1 at ti.com>

Regards,
Nikhil
> ---
> V2:
>  - Make a generic function "spl_reserve_video" under
>    common/spl which can be re-used by other platforms too
>    for reserving video memory from spl.
>
> V3:
>  - Change spl_reserve_video to spl_reserve_video_from_ram_top
>    which enforce framebuffer reservation from end of RAM
>  - Use gd->ram_top instead of local ram_top and update
>    gd->reloc_addr after each reservation
>  - Print error message on framebuffer reservation
>
> V4:
>  - Split this into a separate patch
> ---
>  arch/arm/mach-k3/common.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
> index fd400e7e3d..42ceeb5296 100644
> --- a/arch/arm/mach-k3/common.c
> +++ b/arch/arm/mach-k3/common.c
> @@ -524,19 +524,26 @@ void remove_fwl_configs(struct fwl_data *fwl_data, size_t fwl_data_size)
>  void spl_enable_cache(void)
>  {
>  #if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
> -	phys_addr_t ram_top = CFG_SYS_SDRAM_BASE;
> +	gd->ram_top = CFG_SYS_SDRAM_BASE;
> +	int ret = 0;
>  
>  	dram_init();
>  
>  	/* reserve TLB table */
>  	gd->arch.tlb_size = PGTABLE_SIZE;
>  
> -	ram_top += get_effective_memsize();
> +	gd->ram_top += get_effective_memsize();
>  	/* keep ram_top in the 32-bit address space */
> -	if (ram_top >= 0x100000000)
> -		ram_top = (phys_addr_t) 0x100000000;
> +	if (gd->ram_top >= 0x100000000)
> +		gd->ram_top = (phys_addr_t)0x100000000;
>  
> -	gd->arch.tlb_addr = ram_top - gd->arch.tlb_size;
> +	gd->relocaddr = gd->ram_top;
> +
> +	ret = spl_reserve_video_from_ram_top();
> +	if (ret)
> +		panic("Failed to reserve framebuffer memory (%d)\n", ret);
> +
> +	gd->arch.tlb_addr = gd->relocaddr - gd->arch.tlb_size;
>  	gd->arch.tlb_addr &= ~(0x10000 - 1);
>  	debug("TLB table from %08lx to %08lx\n", gd->arch.tlb_addr,
>  	      gd->arch.tlb_addr + gd->arch.tlb_size);