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x86: tangier: Fix off-by-one error when preparing CSRT

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Intel iDMA 32-bit controller has 17 bits for the maximum block size value.
Due to nature of the binary number representation the maximum value is
2^17 - 1. The original code misses the latter part in equation.

Fixes: 5e99fde34a ("x86: tangier: Populate CSRT for shared DMA controller")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Andy Shevchenko 2019-08-29 17:04:20 +03:00 • committed by Bin Meng
parent 0c6352ec2a
commit 980fe1ab2a
1 changed files with 1 additions and 1 deletions
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arch/x86/cpu/tangier/acpi.c
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@ -95,7 +95,7 @@ static u32 acpi_fill_csrt_dma(struct acpi_csrt_group *grp)
si->dma_address_width = 32;
si->base_request_line = 0;
si->num_handshake_signals = 16;
si->max_block_size = 0x20000;
si->max_block_size = 0x1ffff;
return grp->length;
}