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ARM: OMAP3: Use manual idle for UARTs because of DMA errata

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In sprz318f.pdf "Usage Note 2.7" says that UARTs cannot acknowledge
idle requests in smartidle mode when configured for DMA operations.
This prevents L4 from going idle. So let's use manual idle mode
instead.

Otherwise systems using Sebastian's 8250 patches with DMA will
never enter deeper idle states because of the errata above.

Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Tony Lindgren 2014-09-18 08:58:49 -07:00
parent 6a08b11add
commit a2fc36613a
1 changed files with 4 additions and 4 deletions
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8
arch/arm/mach-omap2/omap_hwmod_3xxx_data.c
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@ -490,7 +490,7 @@ static struct omap_hwmod omap3xxx_uart1_hwmod = {
.mpu_irqs = omap2_uart1_mpu_irqs,
.sdma_reqs = omap2_uart1_sdma_reqs,
.main_clk = "uart1_fck",
.flags = DEBUG_TI81XXUART1_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
.flags = DEBUG_TI81XXUART1_FLAGS | HWMOD_SWSUP_SIDLE,
.prcm = {
.omap2 = {
.module_offs = CORE_MOD,
@ -509,7 +509,7 @@ static struct omap_hwmod omap3xxx_uart2_hwmod = {
.mpu_irqs = omap2_uart2_mpu_irqs,
.sdma_reqs = omap2_uart2_sdma_reqs,
.main_clk = "uart2_fck",
.flags = DEBUG_TI81XXUART2_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
.flags = DEBUG_TI81XXUART2_FLAGS | HWMOD_SWSUP_SIDLE,
.prcm = {
.omap2 = {
.module_offs = CORE_MOD,
@ -529,7 +529,7 @@ static struct omap_hwmod omap3xxx_uart3_hwmod = {
.sdma_reqs = omap2_uart3_sdma_reqs,
.main_clk = "uart3_fck",
.flags = DEBUG_OMAP3UART3_FLAGS | DEBUG_TI81XXUART3_FLAGS |
HWMOD_SWSUP_SIDLE_ACT,
HWMOD_SWSUP_SIDLE,
.prcm = {
.omap2 = {
.module_offs = OMAP3430_PER_MOD,
@ -559,7 +559,7 @@ static struct omap_hwmod omap36xx_uart4_hwmod = {
.mpu_irqs = uart4_mpu_irqs,
.sdma_reqs = uart4_sdma_reqs,
.main_clk = "uart4_fck",
.flags = DEBUG_OMAP3UART4_FLAGS | HWMOD_SWSUP_SIDLE_ACT,
.flags = DEBUG_OMAP3UART4_FLAGS | HWMOD_SWSUP_SIDLE,
.prcm = {
.omap2 = {
.module_offs = OMAP3430_PER_MOD,