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sh: LCDC SYS bus access wait fix

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Update the SuperH Mobile LCDC driver to wait for SYS bus to
become idle after reading or writing. This is needed by the
kfr2r09 board, but also fixes potential problems on other
boards making use of the LCDC in a SYS configuration.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm
2009-08-06 14:28:12 +00:00
committed by Paul Mundt
parent c1155e3499
commit 909f10de5d
1 changed files with 3 additions and 0 deletions
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drivers/video/sh_mobile_lcdcfb.c
+3
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@@ -154,6 +154,7 @@ static void lcdc_sys_write_index(void *handle, unsigned long data)
lcdc_write(ch->lcdc, _LDDWD0R, data | 0x10000000);
lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
}
static void lcdc_sys_write_data(void *handle, unsigned long data)
@@ -163,6 +164,7 @@ static void lcdc_sys_write_data(void *handle, unsigned long data)
lcdc_write(ch->lcdc, _LDDWD0R, data | 0x11000000);
lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
}
static unsigned long lcdc_sys_read_data(void *handle)
@@ -173,6 +175,7 @@ static unsigned long lcdc_sys_read_data(void *handle)
lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
lcdc_write(ch->lcdc, _LDDRAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
udelay(1);
lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
return lcdc_read(ch->lcdc, _LDDRDR) & 0xffff;
}