[PATCH v4, 2/3] drm/mediatek: dsi: Add dsi cmdq_ctl to send panel initial code

[Shuijing Li]

For mt8188, add dsi cmdq reg control to send long packets to panel
initialization. MT8188 hardware has been changed to automatically
set the cmdq_size value by default when sending long packets.
In this patch, the cmdq_size value is set manually instead.
Remain consistent with previous IC.

Signed-off-by: Shuijing Li <shuijing.li at mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
---
Changes in v4:
Add a comment per suggestion from the previous thread:
https://lore.kernel.org/all/14e03873-3723-8293-0190-445a71828b25@collabora.com/
Changes in v3:
reorder patch 2/3 and 3/3, and describe more about why mt8188 need this
patch,
per suggestion from the previous thread:
https://lore.kernel.org/lkml/411ddbf95e2c2298b84899065691d478069ec273.camel@mediatek.com/
Changes in v2:
use mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE_SEL, CMDQ_SIZE_SEL); directly,
per suggestion from the previous thread:
https://lore.kernel.org/lkml/015f4c60-ed77-9e1f-8a6b-cda6e4f6ac93@gmail.com/
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index d8bfc2cce54d..623aa829ef6b 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -86,6 +86,7 @@
 
 #define DSI_CMDQ_SIZE		0x60
 #define CMDQ_SIZE			0x3f
+#define CMDQ_SIZE_SEL		BIT(15)
 
 #define DSI_HSTX_CKL_WC		0x64
 
@@ -178,6 +179,7 @@ struct mtk_dsi_driver_data {
 	const u32 reg_cmdq_off;
 	bool has_shadow_ctl;
 	bool has_size_ctl;
+	bool cmdq_long_packet_ctl;
 };
 
 struct mtk_dsi {
@@ -996,6 +998,10 @@ static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg)
 
 	mtk_dsi_mask(dsi, reg_cmdq_off, cmdq_mask, reg_val);
 	mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE, cmdq_size);
+	if (dsi->driver_data->cmdq_long_packet_ctl) {
+		/* Disable setting cmdq_size automatically for long packets */
+		mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE_SEL, CMDQ_SIZE_SEL);
+	}
 }
 
 static ssize_t mtk_dsi_host_send_cmd(struct mtk_dsi *dsi,
-- 
2.40.1