On 1 June 2018 at 13:00, Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx> wrote:
> This reverts commit e060d376cc61 ("mmc: renesas_sdhi: fix WP detection")
> and adds some code to really fix the regressions.
>
> It was missed so far that Renesas R-Car instantiations of SDHI chose to
> disable internal WP and used the existence of "wp-gpios" to en/disable
> WP at all.
>
> With the first refactoring by Yamada-san with commit ("mmc:
> renesas_sdhi: use MMC_CAP2_NO_WRITE_PROTECT instead of TMIO own flag"),
> WP was always disabled even when GPIOs were present. With Wolfram's
> first fix which gets now reverted, GPIOs were honored. But when not
> available, the fallback was to internal WP and not to disabled WP. This
> caused wrong WP status on uSD card slots.
>
> Restore the old behaviour now. By default, WP is disabled. When a GPIO
> is found, the GPIO re-enables WP. We will think about possible better
> ways to handle this in the future.
>
> Tested on a previously regressing Renesas Lager board (H2) and a still
> working Renesas Salvator-X board (M3-W).
>
> Reported-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Unfortunate this didn't make it for 4.17, however I have applied it for 4.18.
Thanks!
Uffe
> ---
> drivers/mmc/host/renesas_sdhi_core.c | 5 +++++
> drivers/mmc/host/renesas_sdhi_internal_dmac.c | 1 +
> drivers/mmc/host/renesas_sdhi_sys_dmac.c | 3 +++
> 3 files changed, 9 insertions(+)
>
> diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
> index 51e01f03fb99..45c015da2e75 100644
> --- a/drivers/mmc/host/renesas_sdhi_core.c
> +++ b/drivers/mmc/host/renesas_sdhi_core.c
> @@ -28,6 +28,7 @@
> #include <linux/of_device.h>
> #include <linux/platform_device.h>
> #include <linux/mmc/host.h>
> +#include <linux/mmc/slot-gpio.h>
> #include <linux/mfd/tmio.h>
> #include <linux/sh_dma.h>
> #include <linux/delay.h>
> @@ -534,6 +535,10 @@ int renesas_sdhi_probe(struct platform_device *pdev,
> host->multi_io_quirk = renesas_sdhi_multi_io_quirk;
> host->dma_ops = dma_ops;
>
> + /* For some SoC, we disable internal WP. GPIO may override this */
> + if (mmc_can_gpio_ro(host->mmc))
> + mmc_data->capabilities2 &= ~MMC_CAP2_NO_WRITE_PROTECT;
> +
> /* SDR speeds are only available on Gen2+ */
> if (mmc_data->flags & TMIO_MMC_MIN_RCAR2) {
> /* card_busy caused issues on r8a73a4 (pre-Gen2) CD-less SDHI */
> diff --git a/drivers/mmc/host/renesas_sdhi_internal_dmac.c b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
> index b6edb7a695b5..f7f9773d161f 100644
> --- a/drivers/mmc/host/renesas_sdhi_internal_dmac.c
> +++ b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
> @@ -87,6 +87,7 @@ static const struct renesas_sdhi_of_data of_rcar_gen3_compatible = {
> TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2,
> .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
> MMC_CAP_CMD23,
> + .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
> .bus_shift = 2,
> .scc_offset = 0x1000,
> .taps = rcar_gen3_scc_taps,
> diff --git a/drivers/mmc/host/renesas_sdhi_sys_dmac.c b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
> index 848e50c1638a..4bb46c489d71 100644
> --- a/drivers/mmc/host/renesas_sdhi_sys_dmac.c
> +++ b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
> @@ -42,6 +42,7 @@ static const struct renesas_sdhi_of_data of_rz_compatible = {
> static const struct renesas_sdhi_of_data of_rcar_gen1_compatible = {
> .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL,
> .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
> + .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
> };
>
> /* Definitions for sampling clocks */
> @@ -61,6 +62,7 @@ static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = {
> TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2,
> .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
> MMC_CAP_CMD23,
> + .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
> .dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES,
> .dma_rx_offset = 0x2000,
> .scc_offset = 0x0300,
> @@ -81,6 +83,7 @@ static const struct renesas_sdhi_of_data of_rcar_gen3_compatible = {
> TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2,
> .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
> MMC_CAP_CMD23,
> + .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
> .bus_shift = 2,
> .scc_offset = 0x1000,
> .taps = rcar_gen3_scc_taps,
> --
> 2.11.0
>
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