drm/omap: constify write buffers

The write buffers are not modified, so they can be constant.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201215104657.802264-5-tomi.valkeinen@ti.com

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index 2d7350f..91c8c1f 100644 (file)
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -2603,11 +2603,11 @@ static inline void dsi_vc_write_long_payload(struct dsi_data *dsi, int channel,
 }
 
 static int dsi_vc_send_long(struct dsi_data *dsi, int channel, u8 data_type,
-                           u8 *data, u16 len, u8 ecc)
+                           const u8 *data, u16 len, u8 ecc)
 {
        /*u32 val; */
        int i;
-       u8 *p;
+       const u8 *p;
        int r = 0;
        u8 b1, b2, b3, b4;
 
@@ -2700,7 +2700,7 @@ static int dsi_vc_send_null(struct dsi_data *dsi, int channel)
 }
 
 static int dsi_vc_write_nosync_common(struct dsi_data *dsi, int channel,
-                                     u8 *data, int len,
+                                     const u8 *data, int len,
                                      enum dss_dsi_content_type type)
 {
        int r;
@@ -2731,7 +2731,7 @@ static int dsi_vc_write_nosync_common(struct dsi_data *dsi, int channel,
 }
 
 static int dsi_vc_dcs_write_nosync(struct omap_dss_device *dssdev, int channel,
-               u8 *data, int len)
+               const u8 *data, int len)
 {
        struct dsi_data *dsi = to_dsi_data(dssdev);
 
@@ -2740,7 +2740,7 @@ static int dsi_vc_dcs_write_nosync(struct omap_dss_device *dssdev, int channel,
 }
 
 static int dsi_vc_generic_write_nosync(struct omap_dss_device *dssdev, int channel,
-               u8 *data, int len)
+               const u8 *data, int len)
 {
        struct dsi_data *dsi = to_dsi_data(dssdev);
 
@@ -2749,7 +2749,7 @@ static int dsi_vc_generic_write_nosync(struct omap_dss_device *dssdev, int chann
 }
 
 static int dsi_vc_write_common(struct omap_dss_device *dssdev,
-                              int channel, u8 *data, int len,
+                              int channel, const u8 *data, int len,
                               enum dss_dsi_content_type type)
 {
        struct dsi_data *dsi = to_dsi_data(dssdev);
@@ -2778,15 +2778,15 @@ err:
        return r;
 }
 
-static int dsi_vc_dcs_write(struct omap_dss_device *dssdev, int channel, u8 *data,
-               int len)
+static int dsi_vc_dcs_write(struct omap_dss_device *dssdev, int channel,
+               const u8 *data, int len)
 {
        return dsi_vc_write_common(dssdev, channel, data, len,
                        DSS_DSI_CONTENT_DCS);
 }
 
-static int dsi_vc_generic_write(struct omap_dss_device *dssdev, int channel, u8 *data,
-               int len)
+static int dsi_vc_generic_write(struct omap_dss_device *dssdev, int channel,
+               const u8 *data, int len)
 {
        return dsi_vc_write_common(dssdev, channel, data, len,
                        DSS_DSI_CONTENT_GENERIC);
@@ -2812,7 +2812,7 @@ static int dsi_vc_dcs_send_read_request(struct dsi_data *dsi, int channel,
 }
 
 static int dsi_vc_generic_send_read_request(struct dsi_data *dsi, int channel,
-                                           u8 *reqdata, int reqlen)
+                                           const u8 *reqdata, int reqlen)
 {
        u16 data;
        u8 data_type;
@@ -2985,7 +2985,7 @@ err:
 }
 
 static int dsi_vc_generic_read(struct omap_dss_device *dssdev, int channel,
-               u8 *reqdata, int reqlen, u8 *buf, int buflen)
+               const u8 *reqdata, int reqlen, u8 *buf, int buflen)
 {
        struct dsi_data *dsi = to_dsi_data(dssdev);
        int r;

diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
index 491e5ea..3e01711 100644 (file)
--- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
+++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
@@ -312,18 +312,18 @@ struct omapdss_dsi_ops {
 
        /* data transfer */
        int (*dcs_write)(struct omap_dss_device *dssdev, int channel,
-                       u8 *data, int len);
+                       const u8 *data, int len);
        int (*dcs_write_nosync)(struct omap_dss_device *dssdev, int channel,
-                       u8 *data, int len);
+                       const u8 *data, int len);
        int (*dcs_read)(struct omap_dss_device *dssdev, int channel, u8 dcs_cmd,
                        u8 *data, int len);
 
        int (*gen_write)(struct omap_dss_device *dssdev, int channel,
-                       u8 *data, int len);
+                       const u8 *data, int len);
        int (*gen_write_nosync)(struct omap_dss_device *dssdev, int channel,
-                       u8 *data, int len);
+                       const u8 *data, int len);
        int (*gen_read)(struct omap_dss_device *dssdev, int channel,
-                       u8 *reqdata, int reqlen,
+                       const u8 *reqdata, int reqlen,
                        u8 *data, int len);
 
        int (*bta_sync)(struct omap_dss_device *dssdev, int channel);