linux-kernel - [PATCH v2 2/3] drm/mipi-dsi: add mipi_dsi_compression_mode

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Message-Id: <20240330-lg-sw43408-panel-v2-2-293a58717b38@linaro.org>
Date: Sat, 30 Mar 2024 17:00:47 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sumit Semwal <sumit.semwal@...aro.org>, 
 Caleb Connolly <caleb.connolly@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH v2 2/3] drm/mipi-dsi: add mipi_dsi_compression_mode_raw()

The LG SW43408 panel requires sending non-standard data as a part of the
MIPI_DSI_COMPRESSION_MODE packet. Rather than hacking existing
mipi_dsi_compression_mode() add mipi_dsi_compression_mode_raw(), which
accepts raw data buffer and length.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/drm_mipi_dsi.c | 34 ++++++++++++++++++++++++++--------
 include/drm/drm_mipi_dsi.h     |  1 +
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index ef6e416522f8..f340d1e0a9a5 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -645,29 +645,47 @@ int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
 EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
 
 /**
- * mipi_dsi_compression_mode() - enable/disable DSC on the peripheral
+ * mipi_dsi_compression_mode_raw() - control DSC on the peripheral
  * @dsi: DSI peripheral device
- * @enable: Whether to enable or disable the DSC
+ * @data: data to be sent to the device
+ * @len: size of the data buffer
  *
- * Enable or disable Display Stream Compression on the peripheral using the
+ * Control the Display Stream Compression on the peripheral using the
  * default Picture Parameter Set and VESA DSC 1.1 algorithm.
  *
  * Return: 0 on success or a negative error code on failure.
  */
-ssize_t mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable)
+ssize_t mipi_dsi_compression_mode_raw(struct mipi_dsi_device *dsi, void *data, size_t len)
 {
-	/* Note: Needs updating for non-default PPS or algorithm */
-	u8 tx[2] = { enable << 0, 0 };
 	struct mipi_dsi_msg msg = {
 		.channel = dsi->channel,
 		.type = MIPI_DSI_COMPRESSION_MODE,
-		.tx_len = sizeof(tx),
-		.tx_buf = tx,
+		.tx_len = len,
+		.tx_buf = data,
 	};
 	int ret = mipi_dsi_device_transfer(dsi, &msg);
 
 	return (ret < 0) ? ret : 0;
 }
+EXPORT_SYMBOL(mipi_dsi_compression_mode_raw);
+
+/**
+ * mipi_dsi_compression_mode() - enable/disable DSC on the peripheral
+ * @dsi: DSI peripheral device
+ * @enable: Whether to enable or disable the DSC
+ *
+ * Enable or disable Display Stream Compression on the peripheral using the
+ * default Picture Parameter Set and VESA DSC 1.1 algorithm.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+ssize_t mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable)
+{
+	/* Note: Needs updating for non-default PPS or algorithm */
+	u8 tx[2] = { enable << 0, 0 };
+
+	return mipi_dsi_compression_mode_raw(dsi, tx, sizeof(tx));
+}
 EXPORT_SYMBOL(mipi_dsi_compression_mode);
 
 /**
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index c0aec0d4d664..321d2b019687 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -242,6 +242,7 @@ int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
 					    u16 value);
 ssize_t mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable);
+ssize_t mipi_dsi_compression_mode_raw(struct mipi_dsi_device *dsi, void *data, size_t len);
 ssize_t mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
 				       const struct drm_dsc_picture_parameter_set *pps);
 

-- 
2.39.2