drm/i915/dmc: Add sanity check for DMC load address

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For DMC firmware header version 3, the firmware load address is stored
in dmc_info->start_mmioaddr and later used by dmc_load_program().

Unlike the MMIO address table, the firmware load address is not
validated. Add a sanity check to ensure it is within the valid range.

BSpec: 69671, 68378
Fixes: 3d5928a168 ("drm/i915/xelpd: Pipe A DMC plugging")
Cc: stable@vger.kernel.org
Assisted-by: Claude-Code:Sonnet-5
Signed-off-by: Dibin Moolakadan Subrahmanian <dibin.moolakadan.subrahmanian@intel.com>
Reviewed-by: Mitul Golani<mitulkumar.ajitkumar.golani@intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/20260922133535.3180973-6-dibin.moolakadan.subrahmanian@intel.com
(cherry picked from commit 5e47ee5c76ca9becde8df4ad5202845b7ffcbc4c)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

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Dibin Moolakadan Subrahmanian 2026-09-22 19:05:38 +05:30 • committed by Joonas Lahtinen

parent 8bb1858db4

commit 7dedc5bb11

2 changed files with 67 additions and 0 deletions

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55

drivers/gpu/drm/i915/display/intel_dmc.c

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12

drivers/gpu/drm/i915/display/intel_dmc_regs.h

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