linux-kernel - [PATCH v3 3/4] drm/mipi-dsi: add mipi_dsi_compression_mode

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Message-Id: <20240402-lg-sw43408-panel-v3-3-144f17a11a56@linaro.org>
Date: Tue, 02 Apr 2024 02:51:14 +0300
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 v3 3/4] drm/mipi-dsi: add mipi_dsi_compression_mode_ext()

Add the extended version of mipi_dsi_compression_mode(). It provides
a way to specify the algorithm and PPS selector.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/drm_mipi_dsi.c | 33 +++++++++++++++++++++++++++------
 include/drm/drm_mipi_dsi.h     |  9 +++++++++
 2 files changed, 36 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 9874ff6d4718..0ecbc811eb7a 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -645,19 +645,24 @@ 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_ext() - enable/disable DSC on the peripheral
  * @dsi: DSI peripheral device
  * @enable: Whether to enable or disable the DSC
+ * @algo: Selected algorithm
+ * @pps_selector: The PPS selector
  *
- * Enable or disable Display Stream Compression on the peripheral using the
- * default Picture Parameter Set and VESA DSC 1.1 algorithm.
+ * Enable or disable Display Stream Compression on the peripheral.
  *
  * Return: 0 on success or a negative error code on failure.
  */
-int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable)
+int mipi_dsi_compression_mode_ext(struct mipi_dsi_device *dsi, bool enable,
+				  enum mipi_dsi_compression_algo algo,
+				  unsigned int pps_selector)
 {
-	/* Note: Needs updating for non-default PPS or algorithm */
-	u8 tx[2] = { enable << 0, 0 };
+	u8 data = (enable << 0) |
+		(algo << 1) |
+		(pps_selector << 4);
+	u8 tx[2] = { data, 0 };
 	struct mipi_dsi_msg msg = {
 		.channel = dsi->channel,
 		.type = MIPI_DSI_COMPRESSION_MODE,
@@ -668,6 +673,22 @@ int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable)
 
 	return (ret < 0) ? ret : 0;
 }
+EXPORT_SYMBOL(mipi_dsi_compression_mode_ext);
+
+/**
+ * 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.
+ */
+int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable)
+{
+	return mipi_dsi_compression_mode_ext(dsi, enable, 0, MIPI_DSI_COMPRESSION_DSC);
+}
 EXPORT_SYMBOL(mipi_dsi_compression_mode);
 
 /**
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 3011d33eccbd..78cb7b688b1d 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -226,6 +226,12 @@ static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)
 	return -EINVAL;
 }
 
+enum mipi_dsi_compression_algo {
+	MIPI_DSI_COMPRESSION_DSC = 0,
+	MIPI_DSI_COMPRESSION_VENDOR = 3,
+	/* other two values are reserved, DSI 1.3 */
+};
+
 struct mipi_dsi_device *
 mipi_dsi_device_register_full(struct mipi_dsi_host *host,
 			      const struct mipi_dsi_device_info *info);
@@ -242,6 +248,9 @@ 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);
 int mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable);
+int mipi_dsi_compression_mode_ext(struct mipi_dsi_device *dsi, bool enable,
+				  unsigned int pps_selector,
+				  enum mipi_dsi_compression_algo algo);
 int mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
 				   const struct drm_dsc_picture_parameter_set *pps);
 

-- 
2.39.2