Messages in this thread Patch in this message | | | From | Soren Brinkmann <> | Subject | [RESEND PATCH v3 6/9] tty: xuartps: Don't write IRQ disable register to enable interrupts | Date | Fri, 4 Apr 2014 17:23:42 -0700 |
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A comment states, that, according to the data sheet, to enable interrupts the disable register should be written, but the enable register could be left untouched. And it suspsects a HW bug requiring to write both. Reviewing the data sheet, these statements seem wrong. Just as one would expect. Writing to the enable/disable register enables/disables interrupts. Hence the misleading comment and needless write to the disable register are removed from the enable sequence.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Tested-by: Michal Simek <michal.simek@xilinx.com> --- I added a few lines to comment the change and altered the summary line. In case this causes issues it should show up a little easier as a candidate to revert.
Changes in v3: None Changes in v2: None
--- drivers/tty/serial/xilinx_uartps.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index b182ab8cfd07..f9a2c2fc03c4 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -1085,11 +1085,7 @@ static void xuartps_console_write(struct console *co, const char *s, xuartps_writel(ctrl, XUARTPS_CR_OFFSET); - /* restore interrupt state, it seems like there may be a h/w bug - * in that the interrupt enable register should not need to be - * written based on the data sheet - */ - xuartps_writel(~imr, XUARTPS_IDR_OFFSET); + /* restore interrupt state */ xuartps_writel(imr, XUARTPS_IER_OFFSET); if (locked) -- 1.9.1.1.gbb9f595
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