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esp: apply transfer length adjustment when STC is zero at TC load time
Perform the length adjustment whereby a value of 0 in the STC represents a transfer length of 0x10000 at the point where the TC is loaded at the start of a DMA command rather than just when a TI (Transfer Information) command is executed. This better matches the description as given in the datasheet. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20210304221103.6369-12-mark.cave-ayland@ilande.co.uk>
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@ -561,9 +561,6 @@ static void handle_ti(ESPState *s)
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}
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dmalen = esp_get_tc(s);
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if (dmalen == 0) {
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dmalen = 0x10000;
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}
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s->dma_counter = dmalen;
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if (s->do_cmd) {
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@ -698,7 +695,11 @@ void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val)
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if (val & CMD_DMA) {
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s->dma = 1;
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/* Reload DMA counter. */
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esp_set_tc(s, esp_get_stc(s));
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if (esp_get_stc(s) == 0) {
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esp_set_tc(s, 0x10000);
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} else {
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esp_set_tc(s, esp_get_stc(s));
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}
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} else {
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s->dma = 0;
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}
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