On 05/13/2018 06:36 PM, Jassi Brar wrote:
On Tue, May 8, 2018 at 5:14 PM, Mikko Perttunen <mperttunen@xxxxxxxxxx> wrote:
....
+config SERIAL_TEGRA_TCU
+ tristate "NVIDIA Tegra Combined UART"
+ depends on ARCH_TEGRA && MAILBOX
+ select SERIAL_CORE
+ help
+ Support for the mailbox-based TCU (Tegra Combined UART) serial port.
+ TCU is a virtual serial port that allows multiplexing multiple data
+ streams into a single hardware serial port.
+
Maybe make it depend upon TEGRA_HSP_MBOX ?
Yeah, that probably makes more sense. MAILBOX is enough to build it but
it won't be of any use without TEGRA_HSP_MBOX.
......
+
+static void tegra_tcu_write(const char *s, unsigned int count)
+{
+ struct tegra_tcu *tcu = tegra_tcu_uart_port.private_data;
+ unsigned int written = 0, i = 0;
+ bool insert_nl = false;
+ uint32_t value = 0;
+
+ while (i < count) {
+ if (insert_nl) {
+ value |= '\n' << (written++ * 8);
+ insert_nl = false;
+ i++;
+ } else if (s[i] == '\n') {
+ value |= '\r' << (written++ * 8);
+ insert_nl = true;
+ } else {
+ value |= s[i++] << (written++ * 8);
+ }
+
+ if (written == 3) {
+ value |= 3 << 24;
+ value |= BIT(26);
+ mbox_send_message(tcu->tx, &value);
How is this supposed to work? tegra_hsp_doorbell_send_data() ignores
the second argument.
The previous patch in the series adds support for what are called
"shared mailboxes" to the tegra-hsp driver. For these the second
argument is used.
Thanks,
Mikko
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