mmc: sdhci: allow drivers to pre-allocate bounce buffer

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Allow platform drivers to pre-allocate bounce buffer by checking if
host->bounce_buffer is already set before attempting allocation.

This enables platforms with specific DMA constraints (such as 32-bit
DMA on controllers that cannot access high memory) to use their own
reserved memory regions for the bounce buffer.

Suggested-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Albert Yang <yangzh0906@thundersoft.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

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Albert Yang 2026-01-23 17:53:38 +08:00 • committed by Ulf Hansson

parent d515962316

commit ef7eb1a709

1 changed files with 7 additions and 0 deletions

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drivers/mmc/host/sdhci.c

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