30adeee52d
[WHY] Some DPCD addresses, notably LTTPR Capability registers, are expected to be read all together in a single DPCD transaction. Rather than force callers to read registers they don't need, we want to quietly extend the addresses read, and only return back the values the caller asked for. This does not affect DPCD writes. [HOW] Create an additional layer above AUX to perform 'checked' DPCD transactions. Iterate through an array of DPCD address ranges that are marked as being contiguous. If a requested read falls within one of those ranges, extend the read to include the entire range. After DPCD has been queried, copy the requested bytes into the caller's data buffer, and deallocate all resources used. Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com> Reviewed-by: Jun Lei <Jun.Lei@amd.com> Acked-by: Anson Jacob <Anson.Jacob@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
18 lines
371 B
C
18 lines
371 B
C
#ifndef __LINK_DPCD_H__
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#define __LINK_DPCD_H__
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#include <inc/core_status.h>
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#include <dc_link.h>
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#include <inc/link_hwss.h>
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enum dc_status core_link_read_dpcd(
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struct dc_link *link,
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uint32_t address,
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uint8_t *data,
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uint32_t size);
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enum dc_status core_link_write_dpcd(
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struct dc_link *link,
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uint32_t address,
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const uint8_t *data,
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uint32_t size);
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#endif
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