When the DSI is in video mode, all commands are rejected.
Detect current DSI mode in mtk_dsi_host_transfer() and switch modes temporarily to allow commands to be sent.
Signed-off-by: Julien STEPHAN jstephan@baylibre.com Signed-off-by: Mattijs Korpershoek mkorpershoek@baylibre.com --- drivers/gpu/drm/mediatek/mtk_dsi.c | 34 ++++++++++++++++++++++-------- 1 file changed, 25 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index 5d90d2eb0019..7d66fdc7f81d 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -891,24 +891,34 @@ static ssize_t mtk_dsi_host_transfer(struct mipi_dsi_host *host, u8 read_data[16]; void *src_addr; u8 irq_flag = CMD_DONE_INT_FLAG; - - if (readl(dsi->regs + DSI_MODE_CTRL) & MODE) { - DRM_ERROR("dsi engine is not command mode\n"); - return -EINVAL; + u32 dsi_mode; + + dsi_mode = readl(dsi->regs + DSI_MODE_CTRL); + if (dsi_mode & MODE) { + mtk_dsi_stop(dsi); + if (mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500)) { + recv_cnt = -EINVAL; + goto restore_dsi_mode; + } }
if (MTK_DSI_HOST_IS_READ(msg->type)) irq_flag |= LPRX_RD_RDY_INT_FLAG;
- if (mtk_dsi_host_send_cmd(dsi, msg, irq_flag) < 0) - return -ETIME; + if (mtk_dsi_host_send_cmd(dsi, msg, irq_flag) < 0) { + recv_cnt = -ETIME; + goto restore_dsi_mode; + }
- if (!MTK_DSI_HOST_IS_READ(msg->type)) - return 0; + if (!MTK_DSI_HOST_IS_READ(msg->type)) { + recv_cnt = 0; + goto restore_dsi_mode; + }
if (!msg->rx_buf) { DRM_ERROR("dsi receive buffer size may be NULL\n"); - return -EINVAL; + recv_cnt = -EINVAL; + goto restore_dsi_mode; }
for (i = 0; i < 16; i++) @@ -933,6 +943,12 @@ static ssize_t mtk_dsi_host_transfer(struct mipi_dsi_host *host, DRM_INFO("dsi get %d byte data from the panel address(0x%x)\n", recv_cnt, *((u8 *)(msg->tx_buf)));
+restore_dsi_mode: + if (dsi_mode & MODE) { + mtk_dsi_set_mode(dsi); + mtk_dsi_start(dsi); + } + return recv_cnt; }