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atimach64gx: Fix DAC_CNTL for non-byte access.

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If offset is 2, a size of 2 will also overwrite byte 3.
This commit is contained in:
joevt 2024-02-28 00:48:25 -08:00 committed by dingusdev
parent df09a1e3bf
commit bfd60155b6
1 changed files with 1 additions and 1 deletions
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2
devices/video/atimach64gx.cpp
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@ -404,7 +404,7 @@ void AtiMach64Gx::write_reg(uint32_t reg_offset, uint32_t value, uint32_t size)
case ATI_DAC_CNTL:
new_value = value;
// monitor ID is usually accessed using 8bit writes
if (offset == 3) {
if (offset <= 3 && offset + size > 3) {
uint8_t gpio_dirs = extract_bits<uint32_t>(new_value, ATI_DAC_GIO_DIR, ATI_DAC_GIO_DIR_size);
uint8_t gpio_levels = extract_bits<uint32_t>(new_value, ATI_DAC_GIO_STATE, ATI_DAC_GIO_STATE_size);
gpio_levels = this->disp_id->read_monitor_sense(gpio_levels, gpio_dirs);