| Message ID | 20230419060639.38853-2-jaewon02.kim@samsung.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2,1/4] spi: s3c64xx: changed to PIO mode if there is no DMA | expand |
On 19/04/2023 08:06, Jaewon Kim wrote: > Polling mode supported with qurik if there was no DMA in the SOC. typo: quirk You missed verb in your first part of sentence. I don't understand it. > However, there are cased where we cannot or do not want to use DMA. > To support this case, if DMA is not set, it is switched to polling mode. > > Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com> > --- > drivers/spi/spi-s3c64xx.c | 8 ++++++-- > include/linux/platform_data/spi-s3c64xx.h | 1 + > 2 files changed, 7 insertions(+), 2 deletions(-) > > diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c > index 71d324ec9a70..273aa02322d9 100644 > --- a/drivers/spi/spi-s3c64xx.c > +++ b/drivers/spi/spi-s3c64xx.c > @@ -19,7 +19,6 @@ > #include <linux/platform_data/spi-s3c64xx.h> > > #define MAX_SPI_PORTS 12 > -#define S3C64XX_SPI_QUIRK_POLL (1 << 0) > #define S3C64XX_SPI_QUIRK_CS_AUTO (1 << 1) > #define AUTOSUSPEND_TIMEOUT 2000 > > @@ -116,7 +115,7 @@ > #define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT > > #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) > -#define is_polling(x) (x->port_conf->quirks & S3C64XX_SPI_QUIRK_POLL) > +#define is_polling(x) (x->cntrlr_info->polling) > > #define RXBUSY (1<<2) > #define TXBUSY (1<<3) > @@ -1067,6 +1066,11 @@ static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev) > sci->num_cs = temp; > } > > + if (!of_find_property(dev->of_node, "dmas", NULL)) { > + dev_warn(dev, "cannot find DMA, changed to PIO mode\n"); You said it is desired option, so should not be a warning. I would make it debug at most. > + sci->polling = 1; Best regards, Krzysztof
On 19/04/2023 10:31, Jaewon Kim wrote: > > On 23. 4. 19. 17:03, Krzysztof Kozlowski wrote: >> On 19/04/2023 08:06, Jaewon Kim wrote: >>> Polling mode supported with qurik if there was no DMA in the SOC. >> typo: quirk >> You missed verb in your first part of sentence. I don't understand it. > > Sorry, I change this sentence like below. > > Polling mode supported as a quirk for SOCs without DMA. I would say still verb is missing as supported in past tense does not make sense. See: https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95 > Best regards, Krzysztof
On 19/04/2023 08:06, Jaewon Kim wrote: > Polling mode supported with qurik if there was no DMA in the SOC. > However, there are cased where we cannot or do not want to use DMA. > To support this case, if DMA is not set, it is switched to polling mode. > (...) > #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) > -#define is_polling(x) (x->port_conf->quirks & S3C64XX_SPI_QUIRK_POLL) > +#define is_polling(x) (x->cntrlr_info->polling) > > #define RXBUSY (1<<2) > #define TXBUSY (1<<3) > @@ -1067,6 +1066,11 @@ static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev) > sci->num_cs = temp; > } > > + if (!of_find_property(dev->of_node, "dmas", NULL)) { of_property_present() Best regards, Krzysztof
On 23. 4. 21. 00:40, Krzysztof Kozlowski wrote: > On 19/04/2023 08:06, Jaewon Kim wrote: >> Polling mode supported with qurik if there was no DMA in the SOC. >> However, there are cased where we cannot or do not want to use DMA. >> To support this case, if DMA is not set, it is switched to polling mode. >> > (...) > >> #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) >> -#define is_polling(x) (x->port_conf->quirks & S3C64XX_SPI_QUIRK_POLL) >> +#define is_polling(x) (x->cntrlr_info->polling) >> >> #define RXBUSY (1<<2) >> #define TXBUSY (1<<3) >> @@ -1067,6 +1066,11 @@ static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev) >> sci->num_cs = temp; >> } >> >> + if (!of_find_property(dev->of_node, "dmas", NULL)) { > of_property_present() I will change it to of_property_present(). > > Best regards, > Krzysztof > > Thanks Jaewon Kim
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 71d324ec9a70..273aa02322d9 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -19,7 +19,6 @@ #include <linux/platform_data/spi-s3c64xx.h> #define MAX_SPI_PORTS 12 -#define S3C64XX_SPI_QUIRK_POLL (1 << 0) #define S3C64XX_SPI_QUIRK_CS_AUTO (1 << 1) #define AUTOSUSPEND_TIMEOUT 2000 @@ -116,7 +115,7 @@ #define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) -#define is_polling(x) (x->port_conf->quirks & S3C64XX_SPI_QUIRK_POLL) +#define is_polling(x) (x->cntrlr_info->polling) #define RXBUSY (1<<2) #define TXBUSY (1<<3) @@ -1067,6 +1066,11 @@ static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev) sci->num_cs = temp; } + if (!of_find_property(dev->of_node, "dmas", NULL)) { + dev_warn(dev, "cannot find DMA, changed to PIO mode\n"); + sci->polling = 1; + } + sci->no_cs = of_property_read_bool(dev->of_node, "no-cs-readback"); return sci; diff --git a/include/linux/platform_data/spi-s3c64xx.h b/include/linux/platform_data/spi-s3c64xx.h index 5df1ace6d2c9..cb7b8ddc899f 100644 --- a/include/linux/platform_data/spi-s3c64xx.h +++ b/include/linux/platform_data/spi-s3c64xx.h @@ -35,6 +35,7 @@ struct s3c64xx_spi_info { int src_clk_nr; int num_cs; bool no_cs; + bool polling; int (*cfg_gpio)(void); };
Polling mode supported with qurik if there was no DMA in the SOC. However, there are cased where we cannot or do not want to use DMA. To support this case, if DMA is not set, it is switched to polling mode. Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com> --- drivers/spi/spi-s3c64xx.c | 8 ++++++-- include/linux/platform_data/spi-s3c64xx.h | 1 + 2 files changed, 7 insertions(+), 2 deletions(-)