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drivers: mipi_dsi: dsi_mcux: limit DSI TX to max payload size

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Limit DSI data TX to the max payload size possible with this peripheral,
rather than relying on display drivers to respect this limitation.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
This commit is contained in:
Daniel DeGrasse 2023-05-05 15:16:40 +00:00 • committed by Carles Cufí
commit 9bcd8e9b3e
1 changed files with 13 additions and 2 deletions
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15
drivers/mipi_dsi/dsi_mcux.c
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@ -39,6 +39,9 @@ LOG_MODULE_REGISTER(dsi_mcux, CONFIG_MIPI_DSI_LOG_LEVEL);
#define DSI_DPHY_PLL_CO_MIN 0
#define DSI_DPHY_PLL_CO_MAX 3
/* MAX DSI TX payload */
#define DSI_TX_MAX_PAYLOAD_BYTE (64U * 4U)
struct display_mcux_mipi_dsi_config {
MIPI_DSI_Type base;
dsi_dpi_config_t dpi_config;
@ -251,6 +254,14 @@ static ssize_t dsi_mcux_transfer(const struct device *dev, uint8_t channel,
dsi_xfer.dscCmd = msg->cmd;
dsi_xfer.flags = kDSI_TransferUseHighSpeed;
dsi_xfer.txDataType = kDSI_TxDataDcsLongWr;
/*
* Cap transfer size. Note that we subtract six bytes here,
* one for the DSC command and one to insure that
* transfers are still aligned on a pixel boundary
* (two or three byte pixel sizes are supported).
*/
dsi_xfer.txDataSize = MIN(dsi_xfer.txDataSize,
(DSI_TX_MAX_PAYLOAD_BYTE - 6));
break;
case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
dsi_xfer.txDataType = kDSI_TxDataGenShortWrNoParam;
@ -285,11 +296,11 @@ static ssize_t dsi_mcux_transfer(const struct device *dev, uint8_t channel,
if (msg->rx_len != 0) {
/* Return rx_len on a read */
return msg->rx_len;
return dsi_xfer.rxDataSize;
}
/* Return tx_len on a write */
return msg->tx_len;
return dsi_xfer.txDataSize;
}