sh: LCDC start_transfer() for the KFR2R09 board

This patch adds a ->start_transfer() callback to the
KFR2R09 lcd handling code. The callback is used to
notify the lcd controller that a new frame of data
is about to be transferred. The callback is only used
in combination with deferred io, but the code has
been tested both with and without deferred io enabled.

Without this patch the display data on the KFR2R09
lcd panel becomes corrupted over time.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/boards/mach-kfr2r09/lcd_wqvga.c b/arch/sh/boards/mach-kfr2r09/lcd_wqvga.c
index 8ccb1cc8b5890fed7fe0014c6d10b50133fa306e..e9b970846c41fcb0c96a105ed277059f722a57b3 100644 (file)
--- a/arch/sh/boards/mach-kfr2r09/lcd_wqvga.c
+++ b/arch/sh/boards/mach-kfr2r09/lcd_wqvga.c
@@ -273,6 +273,12 @@ int kfr2r09_lcd_setup(void *board_data, void *sohandle,
        return 0;
 }
 
+void kfr2r09_lcd_start(void *board_data, void *sohandle,
+                      struct sh_mobile_lcdc_sys_bus_ops *so)
+{
+       write_memory_start(sohandle, so);
+}
+
 #define CTRL_CKSW       0x10
 #define CTRL_C10        0x20
 #define CTRL_CPSW       0x80

diff --git a/arch/sh/boards/mach-kfr2r09/setup.c b/arch/sh/boards/mach-kfr2r09/setup.c
index 87438d6603d63e89502d146cba841a5b7feaeba5..5cf7a6e8aeaa2a524068133b722090a3c1250b11 100644 (file)
--- a/arch/sh/boards/mach-kfr2r09/setup.c
+++ b/arch/sh/boards/mach-kfr2r09/setup.c
@@ -149,6 +149,7 @@ static struct sh_mobile_lcdc_info kfr2r09_sh_lcdc_info = {
                },
                .board_cfg = {
                        .setup_sys = kfr2r09_lcd_setup,
+                       .start_transfer = kfr2r09_lcd_start,
                        .display_on = kfr2r09_lcd_on,
                        .display_off = kfr2r09_lcd_off,
                },

diff --git a/arch/sh/include/mach-kfr2r09/mach/kfr2r09.h b/arch/sh/include/mach-kfr2r09/mach/kfr2r09.h
index 174374e19547f4baf93157360a71b7f487b4202f..484ef42c2fb5b8d35084f9ef38c9693edadd5a16 100644 (file)
--- a/arch/sh/include/mach-kfr2r09/mach/kfr2r09.h
+++ b/arch/sh/include/mach-kfr2r09/mach/kfr2r09.h
@@ -8,6 +8,8 @@ void kfr2r09_lcd_on(void *board_data);
 void kfr2r09_lcd_off(void *board_data);
 int kfr2r09_lcd_setup(void *board_data, void *sys_ops_handle,
                      struct sh_mobile_lcdc_sys_bus_ops *sys_ops);
+void kfr2r09_lcd_start(void *board_data, void *sys_ops_handle,
+                      struct sh_mobile_lcdc_sys_bus_ops *sys_ops);
 #else
 static inline void kfr2r09_lcd_on(void *board_data) {}
 static inline void kfr2r09_lcd_off(void *board_data) {}
@@ -16,6 +18,10 @@ static inline int kfr2r09_lcd_setup(void *board_data, void *sys_ops_handle,
 {
        return -ENODEV;
 }
+static inline void kfr2r09_lcd_start(void *board_data, void *sys_ops_handle,
+                                    struct sh_mobile_lcdc_sys_bus_ops *sys_ops)
+{
+}
 #endif
 
 #endif /* __ASM_SH_KFR2R09_H */