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aspeed/smc: handle dummies only in fast read mode

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HW works fine in normal read mode with dummy bytes being set. So let's
check this case to not transfer bytes.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-id: 1486648058-520-4-git-send-email-clg@kaod.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Cédric Le Goater 2017-02-10 17:40:29 +00:00 committed by Peter Maydell
parent 93bf276d5f
commit 1a6d4fc27d
1 changed files with 6 additions and 3 deletions
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9
hw/ssi/aspeed_smc.c
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@ -536,10 +536,13 @@ static uint64_t aspeed_smc_flash_read(void *opaque, hwaddr addr, unsigned size)
/*
* Use fake transfers to model dummy bytes. The value should
* be configured to some non-zero value in fast read mode and
* zero in read mode.
* zero in read mode. But, as the HW allows inconsistent
* settings, let's check for fast read mode.
*/
for (i = 0; i < aspeed_smc_flash_dummies(fl); i++) {
ssi_transfer(fl->controller->spi, 0xFF);
if (aspeed_smc_flash_mode(fl) == CTRL_FREADMODE) {
for (i = 0; i < aspeed_smc_flash_dummies(fl); i++) {
ssi_transfer(fl->controller->spi, 0xFF);
}
}
for (i = 0; i < size; i++) {